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[KX3] New Product: SPX3 External Speaker

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Robert J. Morris

[KX3] New Product: SPX3 External Speaker

I've built a prototype powered external speaker for the KX3, and would
like some feedback on what folks would desire in terms of features, and
whether folks would want to own one.

The speaker currently is designed to match the overall look of the KX3
and PX3, and accept similar third-party panels and covers as for the KX
line. Presently, it uses the same legs and feet as the KX3 and PX3, and
is the same height and depth as those. There is one USB port for
charging the internal lithium battery, and input and output stereo
jacks. The speaker is mono. The output jack redirects the right channel
from the stereo input for a second speaker, just like with the Elecraft
SP3 and other similar external speakers. The speaker is amplified.

The SPX3 puts out a maximum of 3W, and is about as loud as any external
radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
PHONES jack. There is a built-in low pass filter to reduce noise and
improve the listening experience.

The prototype, as you'll see in pictures in the links below, is slightly
narrower than the expected finished product. The speaker driver and
on/off switch are both waterproof, but - just like the KX3 and PX3 - the
case isn't. So, don't drop it in a lake. It will handle all conditions
appropriate for the KX3, and is meant for indoor and outdoor use. Having
matched the case design so closely to the KX3, it isn't as airtight as
I'd like it, so the next prototype will have the case halves join in a
more customary way, but remain the same dimensions and overall look.
This will also improve ingress protection.

You'll see the speaker is not a polished finished product yet, as it's a
rough first prototype made by hand. Your feedback will assure the final
product is what you want gracing your portable shack.

Please note, the KX3 in the photo is only to demonstrate the speaker.

All feedback is welcome. Please let me know which reasonable
enhancements or simplifications you'd like to see.
Examples:
* Would you want an output USB port to use the speaker to charge your
phone?
* Would you want to dispense with the built-in battery, and run it
entirely from external power?
* Would you want a second passive speaker driven by the first to save on
weight and cost? That is, a SPX3A (active, with battery, charger, and
amp) and SPX3P (passive, with only speaker driver)
* If you're a KX2 user, would you like me to produce the SPX2 (also in
development)?

Pictures:
SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
SPX3 Left Oblique:
http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
SPX3 Right Oblique:
http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG

73,
Robert (AG6ZZ)

SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
J. Morris
SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
Robert J. Morris
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Paul Van Dyke

Re: [KX3] New Product: SPX3 External Speaker

I am interested .. the battery operation in interesting .. no usb for my phone

Paul KB9AVO

On 4/12/18, Robert J. Morris <[hidden email]> wrote:

> I've built a prototype powered external speaker for the KX3, and would
> like some feedback on what folks would desire in terms of features, and
> whether folks would want to own one.
>
> The speaker currently is designed to match the overall look of the KX3
> and PX3, and accept similar third-party panels and covers as for the KX
> line. Presently, it uses the same legs and feet as the KX3 and PX3, and
> is the same height and depth as those. There is one USB port for
> charging the internal lithium battery, and input and output stereo
> jacks. The speaker is mono. The output jack redirects the right channel
> from the stereo input for a second speaker, just like with the Elecraft
> SP3 and other similar external speakers. The speaker is amplified.
>
> The SPX3 puts out a maximum of 3W, and is about as loud as any external
> radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
> PHONES jack. There is a built-in low pass filter to reduce noise and
> improve the listening experience.
>
> The prototype, as you'll see in pictures in the links below, is slightly
> narrower than the expected finished product. The speaker driver and
> on/off switch are both waterproof, but - just like the KX3 and PX3 - the
> case isn't. So, don't drop it in a lake. It will handle all conditions
> appropriate for the KX3, and is meant for indoor and outdoor use. Having
> matched the case design so closely to the KX3, it isn't as airtight as
> I'd like it, so the next prototype will have the case halves join in a
> more customary way, but remain the same dimensions and overall look.
> This will also improve ingress protection.
>
> You'll see the speaker is not a polished finished product yet, as it's a
> rough first prototype made by hand. Your feedback will assure the final
> product is what you want gracing your portable shack.
>
> Please note, the KX3 in the photo is only to demonstrate the speaker.
>
> All feedback is welcome. Please let me know which reasonable
> enhancements or simplifications you'd like to see.
> Examples:
> * Would you want an output USB port to use the speaker to charge your
> phone?
> * Would you want to dispense with the built-in battery, and run it
> entirely from external power?
> * Would you want a second passive speaker driven by the first to save on
> weight and cost? That is, a SPX3A (active, with battery, charger, and
> amp) and SPX3P (passive, with only speaker driver)
> * If you're a KX2 user, would you like me to produce the SPX2 (also in
> development)?
>
> Pictures:
> SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
> SPX3 Left Oblique:
> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
> SPX3 Right Oblique:
> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG
>
> 73,
> Robert (AG6ZZ)
>
> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
> J. Morris
> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
> Robert J. Morris
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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Robert J. Morris

Re: [KX3] New Product: SPX3 External Speaker

Hi Paul,

Thanks for sharing your interest. I'm glad you don't want a USB output
port. Although it wouldn't be difficult, it's beyond the purpose of the
product.

73,
Robert (AG6ZZ)

On 2018-04-12 15:58, Paul Van Dyke wrote:

> I am interested .. the battery operation in interesting .. no usb for my phone
>
> Paul KB9AVO
>
> On 4/12/18, Robert J. Morris <[hidden email]> wrote:
>
>> I've built a prototype powered external speaker for the KX3, and would
>> like some feedback on what folks would desire in terms of features, and
>> whether folks would want to own one.
>>
>> The speaker currently is designed to match the overall look of the KX3
>> and PX3, and accept similar third-party panels and covers as for the KX
>> line. Presently, it uses the same legs and feet as the KX3 and PX3, and
>> is the same height and depth as those. There is one USB port for
>> charging the internal lithium battery, and input and output stereo
>> jacks. The speaker is mono. The output jack redirects the right channel
>> from the stereo input for a second speaker, just like with the Elecraft
>> SP3 and other similar external speakers. The speaker is amplified.
>>
>> The SPX3 puts out a maximum of 3W, and is about as loud as any external
>> radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
>> PHONES jack. There is a built-in low pass filter to reduce noise and
>> improve the listening experience.
>>
>> The prototype, as you'll see in pictures in the links below, is slightly
>> narrower than the expected finished product. The speaker driver and
>> on/off switch are both waterproof, but - just like the KX3 and PX3 - the
>> case isn't. So, don't drop it in a lake. It will handle all conditions
>> appropriate for the KX3, and is meant for indoor and outdoor use. Having
>> matched the case design so closely to the KX3, it isn't as airtight as
>> I'd like it, so the next prototype will have the case halves join in a
>> more customary way, but remain the same dimensions and overall look.
>> This will also improve ingress protection.
>>
>> You'll see the speaker is not a polished finished product yet, as it's a
>> rough first prototype made by hand. Your feedback will assure the final
>> product is what you want gracing your portable shack.
>>
>> Please note, the KX3 in the photo is only to demonstrate the speaker.
>>
>> All feedback is welcome. Please let me know which reasonable
>> enhancements or simplifications you'd like to see.
>> Examples:
>> * Would you want an output USB port to use the speaker to charge your
>> phone?
>> * Would you want to dispense with the built-in battery, and run it
>> entirely from external power?
>> * Would you want a second passive speaker driven by the first to save on
>> weight and cost? That is, a SPX3A (active, with battery, charger, and
>> amp) and SPX3P (passive, with only speaker driver)
>> * If you're a KX2 user, would you like me to produce the SPX2 (also in
>> development)?
>>
>> Pictures:
>> SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
>> SPX3 Left Oblique:
>> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
>> SPX3 Right Oblique:
>> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG
>>
>> 73,
>> Robert (AG6ZZ)
>>
>> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
>> J. Morris
>> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
>> Robert J. Morris
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]

Joan

Re: [KX3] New Product: SPX3 External Speaker

In reply to this post by Robert J. Morris

What I would love [to buy] for the KX2: a pair of speakers, thus: an SPX2A speaker (with an inboard stereo amplifier) which can be used alone as a monaural speaker—but which is also configurable for stereo audio with the addition of the optional SPX2P

Joan KX2CW

Darmok and Jalad at Tanagra, said Piglet.
Shaka, when the walls fell, said Pooh.

> On Apr 12, 2018, at 10:06, Robert J. Morris <[hidden email]> wrote:
>
> I've built a prototype powered external speaker for the KX3, and would
> like some feedback on what folks would desire in terms of features, and
> whether folks would want to own one.
>
> The speaker currently is designed to match the overall look of the KX3
> and PX3, and accept similar third-party panels and covers as for the KX
> line. Presently, it uses the same legs and feet as the KX3 and PX3, and
> is the same height and depth as those. There is one USB port for
> charging the internal lithium battery, and input and output stereo
> jacks. The speaker is mono. The output jack redirects the right channel
> from the stereo input for a second speaker, just like with the Elecraft
> SP3 and other similar external speakers. The speaker is amplified.
>
> The SPX3 puts out a maximum of 3W, and is about as loud as any external
> radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
> PHONES jack. There is a built-in low pass filter to reduce noise and
> improve the listening experience.
>
> The prototype, as you'll see in pictures in the links below, is slightly
> narrower than the expected finished product. The speaker driver and
> on/off switch are both waterproof, but - just like the KX3 and PX3 - the
> case isn't. So, don't drop it in a lake. It will handle all conditions
> appropriate for the KX3, and is meant for indoor and outdoor use. Having
> matched the case design so closely to the KX3, it isn't as airtight as
> I'd like it, so the next prototype will have the case halves join in a
> more customary way, but remain the same dimensions and overall look.
> This will also improve ingress protection.
>
> You'll see the speaker is not a polished finished product yet, as it's a
> rough first prototype made by hand. Your feedback will assure the final
> product is what you want gracing your portable shack.
>
> Please note, the KX3 in the photo is only to demonstrate the speaker.
>
> All feedback is welcome. Please let me know which reasonable
> enhancements or simplifications you'd like to see.
> Examples:
> * Would you want an output USB port to use the speaker to charge your
> phone?
> * Would you want to dispense with the built-in battery, and run it
> entirely from external power?
> * Would you want a second passive speaker driven by the first to save on
> weight and cost? That is, a SPX3A (active, with battery, charger, and
> amp) and SPX3P (passive, with only speaker driver)
> * If you're a KX2 user, would you like me to produce the SPX2 (also in
> development)?
>
> Pictures:
> SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
> SPX3 Left Oblique:
> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
> SPX3 Right Oblique:
> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG
>
> 73,
> Robert (AG6ZZ)
>
> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
> J. Morris
> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
> Robert J. Morris

Robert J. Morris

Re: [KX3] New Product: SPX3 External Speaker

Thanks for the feedback, Joan. It appears the active and passive
versions are what folks would like.

73,
Robert (AG6ZZ)

On 2018-04-12 23:53, Joan wrote:

> What I would love [to buy] for the KX2: a pair of speakers, thus: an SPX2A speaker (with an inboard stereo amplifier) which can be used alone as a monaural speaker--but which is also configurable for stereo audio with the addition of the optional SPX2P
>
> Joan KX2CW
>
> Darmok and Jalad at Tanagra, said Piglet.
> Shaka, when the walls fell, said Pooh.
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John Gibson

Re: [KX3] New Product: SPX3 External Speaker

In reply to this post by Robert J. Morris

Hi Robert,

Your proposed speaker looks interesting. Thank you for offering it.

My need is a little different. I want to use a KX2 for portable emergency communication, powering it directly from a 12V lithium iron phosphate (LFP) battery. For this application I would like to power an external amplified speaker directly from the same 12V LFP battery. I would be rather not have to recharge an amplified speaker's internal battery.

73,
John, no8v

________________________________________
From: [hidden email] <[hidden email]> on behalf of Robert J. Morris <[hidden email]>
Sent: Thursday, April 12, 2018 1:06:25 PM
To: [hidden email]
Subject: [Elecraft] [KX3] New Product: SPX3 External Speaker

I've built a prototype powered external speaker for the KX3, and would
like some feedback on what folks would desire in terms of features, and
whether folks would want to own one.

The speaker currently is designed to match the overall look of the KX3
and PX3, and accept similar third-party panels and covers as for the KX
line. Presently, it uses the same legs and feet as the KX3 and PX3, and
is the same height and depth as those. There is one USB port for
charging the internal lithium battery, and input and output stereo
jacks. The speaker is mono. The output jack redirects the right channel
from the stereo input for a second speaker, just like with the Elecraft
SP3 and other similar external speakers. The speaker is amplified.

The SPX3 puts out a maximum of 3W, and is about as loud as any external
radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
PHONES jack. There is a built-in low pass filter to reduce noise and
improve the listening experience.

The prototype, as you'll see in pictures in the links below, is slightly
narrower than the expected finished product. The speaker driver and
on/off switch are both waterproof, but - just like the KX3 and PX3 - the
case isn't. So, don't drop it in a lake. It will handle all conditions
appropriate for the KX3, and is meant for indoor and outdoor use. Having
matched the case design so closely to the KX3, it isn't as airtight as
I'd like it, so the next prototype will have the case halves join in a
more customary way, but remain the same dimensions and overall look.
This will also improve ingress protection.

You'll see the speaker is not a polished finished product yet, as it's a
rough first prototype made by hand. Your feedback will assure the final
product is what you want gracing your portable shack.

Please note, the KX3 in the photo is only to demonstrate the speaker.

All feedback is welcome. Please let me know which reasonable
enhancements or simplifications you'd like to see.
Examples:
* Would you want an output USB port to use the speaker to charge your
phone?
* Would you want to dispense with the built-in battery, and run it
entirely from external power?
* Would you want a second passive speaker driven by the first to save on
weight and cost? That is, a SPX3A (active, with battery, charger, and
amp) and SPX3P (passive, with only speaker driver)
* If you're a KX2 user, would you like me to produce the SPX2 (also in
development)?

Pictures:
SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
SPX3 Left Oblique:
http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
SPX3 Right Oblique:
http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG

73,
Robert (AG6ZZ)

SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
J. Morris
SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
Robert J. Morris
______________________________________________________________
Elecraft mailing list
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]
______________________________________________________________
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Message delivered to [hidden email]

Robert J. Morris

Re: [KX3] New Product: SPX3 External Speaker

Hi John,

Thanks for your feedback. It appears I didn't point out that the speaker
can be powered externally, with or without an internal battery. I'm also
going to change the power requirement to the standard ham shack
12V/13.8V. Actually, it will accept the same voltage range as the KX3
(9-15V DC).

73,
Robert (AG6ZZ)

On 2018-04-13 11:32, John Gibson wrote:

> Hi Robert,
>
> Your proposed speaker looks interesting. Thank you for offering it.
>
> My need is a little different. I want to use a KX2 for portable emergency communication, powering it directly from a 12V lithium iron phosphate (LFP) battery. For this application I would like to power an external amplified speaker directly from the same 12V LFP battery. I would be rather not have to recharge an amplified speaker's internal battery.
>
> 73,
> John, no8v
>
> ________________________________________
> From: [hidden email] <[hidden email]> on behalf of Robert J. Morris <[hidden email]>
> Sent: Thursday, April 12, 2018 1:06:25 PM
> To: [hidden email]
> Subject: [Elecraft] [KX3] New Product: SPX3 External Speaker
>
> I've built a prototype powered external speaker for the KX3, and would
> like some feedback on what folks would desire in terms of features, and
> whether folks would want to own one.
>
> The speaker currently is designed to match the overall look of the KX3
> and PX3, and accept similar third-party panels and covers as for the KX
> line. Presently, it uses the same legs and feet as the KX3 and PX3, and
> is the same height and depth as those. There is one USB port for
> charging the internal lithium battery, and input and output stereo
> jacks. The speaker is mono. The output jack redirects the right channel
> from the stereo input for a second speaker, just like with the Elecraft
> SP3 and other similar external speakers. The speaker is amplified.
>
> The SPX3 puts out a maximum of 3W, and is about as loud as any external
> radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
> PHONES jack. There is a built-in low pass filter to reduce noise and
> improve the listening experience.
>
> The prototype, as you'll see in pictures in the links below, is slightly
> narrower than the expected finished product. The speaker driver and
> on/off switch are both waterproof, but - just like the KX3 and PX3 - the
> case isn't. So, don't drop it in a lake. It will handle all conditions
> appropriate for the KX3, and is meant for indoor and outdoor use. Having
> matched the case design so closely to the KX3, it isn't as airtight as
> I'd like it, so the next prototype will have the case halves join in a
> more customary way, but remain the same dimensions and overall look.
> This will also improve ingress protection.
>
> You'll see the speaker is not a polished finished product yet, as it's a
> rough first prototype made by hand. Your feedback will assure the final
> product is what you want gracing your portable shack.
>
> Please note, the KX3 in the photo is only to demonstrate the speaker.
>
> All feedback is welcome. Please let me know which reasonable
> enhancements or simplifications you'd like to see.
> Examples:
> * Would you want an output USB port to use the speaker to charge your
> phone?
> * Would you want to dispense with the built-in battery, and run it
> entirely from external power?
> * Would you want a second passive speaker driven by the first to save on
> weight and cost? That is, a SPX3A (active, with battery, charger, and
> amp) and SPX3P (passive, with only speaker driver)
> * If you're a KX2 user, would you like me to produce the SPX2 (also in
> development)?
>
> Pictures:
> SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
> SPX3 Left Oblique:
> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
> SPX3 Right Oblique:
> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG
>
> 73,
> Robert (AG6ZZ)
>
> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
> J. Morris
> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
> Robert J. Morris
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

Cady, Fred-2

Re: [KX3] New Product: SPX3 External Speaker

In reply to this post by John Gibson

Hi Robert,

I'm thinking you could greatly expand your potential market by having two speakers and supporting stereo audio. That way people could use the KX3 dual watch feature without having to plug in headphones. It might also be attractive for K3 users (like me) suffering from a space problem. I use the West Mountain speakers and love them but would like something smaller.

Just a thought.

Good luck.

73,

Fred KE7X

________________________________
From: [hidden email] <[hidden email]> on behalf of John Gibson <[hidden email]>
Sent: Friday, April 13, 2018 12:32 PM
To: Robert J. Morris; [hidden email]
Subject: Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

Hi Robert,

Your proposed speaker looks interesting. Thank you for offering it.

My need is a little different. I want to use a KX2 for portable emergency communication, powering it directly from a 12V lithium iron phosphate (LFP) battery. For this application I would like to power an external amplified speaker directly from the same 12V LFP battery. I would be rather not have to recharge an amplified speaker's internal battery.

73,
John, no8v

________________________________________
From: [hidden email] <[hidden email]> on behalf of Robert J. Morris <[hidden email]>
Sent: Thursday, April 12, 2018 1:06:25 PM
To: [hidden email]
Subject: [Elecraft] [KX3] New Product: SPX3 External Speaker

I've built a prototype powered external speaker for the KX3, and would
like some feedback on what folks would desire in terms of features, and
whether folks would want to own one.

The speaker currently is designed to match the overall look of the KX3
and PX3, and accept similar third-party panels and covers as for the KX
line. Presently, it uses the same legs and feet as the KX3 and PX3, and
is the same height and depth as those. There is one USB port for
charging the internal lithium battery, and input and output stereo
jacks. The speaker is mono. The output jack redirects the right channel
from the stereo input for a second speaker, just like with the Elecraft
SP3 and other similar external speakers. The speaker is amplified.

The SPX3 puts out a maximum of 3W, and is about as loud as any external
radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
PHONES jack. There is a built-in low pass filter to reduce noise and
improve the listening experience.

The prototype, as you'll see in pictures in the links below, is slightly
narrower than the expected finished product. The speaker driver and
on/off switch are both waterproof, but - just like the KX3 and PX3 - the
case isn't. So, don't drop it in a lake. It will handle all conditions
appropriate for the KX3, and is meant for indoor and outdoor use. Having
matched the case design so closely to the KX3, it isn't as airtight as
I'd like it, so the next prototype will have the case halves join in a
more customary way, but remain the same dimensions and overall look.
This will also improve ingress protection.

You'll see the speaker is not a polished finished product yet, as it's a
rough first prototype made by hand. Your feedback will assure the final
product is what you want gracing your portable shack.

Please note, the KX3 in the photo is only to demonstrate the speaker.

All feedback is welcome. Please let me know which reasonable
enhancements or simplifications you'd like to see.
Examples:
* Would you want an output USB port to use the speaker to charge your
phone?
* Would you want to dispense with the built-in battery, and run it
entirely from external power?
* Would you want a second passive speaker driven by the first to save on
weight and cost? That is, a SPX3A (active, with battery, charger, and
amp) and SPX3P (passive, with only speaker driver)
* If you're a KX2 user, would you like me to produce the SPX2 (also in
development)?

Pictures:
SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
SPX3 Left Oblique:
http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
SPX3 Right Oblique:
http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG

73,
Robert (AG6ZZ)

SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
J. Morris
SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
Robert J. Morris
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Robert J. Morris

Re: [KX3] New Product: SPX3 External Speaker

Hi Fred,

Thanks for your feedback. I appreciate it very much. I guess I didn't
make it clear enough in the long description. The SPX3 already has
support for exactly what you're requesting. Just like the Elecraft SP3
and other similar desktop radio speakers, it splits the right channel
and sends it out the left channel of the output stereo jack. The right
channel of the output is unused. (or did I split off the left channel?
same difference) That way, two identical speakers can be used in stereo
when daisy-chained.

Since the SPX3 tilts to have the driver cone aimed up at an angle, I
find it more easily puts my ears in the listening sweet spot than having
to prop up a forward facing speaker on a shelf. At any rate, the dual
watch and stereo effects features of the KX3 can be enjoyed using a pair
of SPX3s; likely as SPX3A and SPX3P. Also, the amplified SPX3 or SPX3A
can be powered externally, with or without the internal battery.

This brings us to a big question. Should I sell the SPX3A and SPX3P as a
pair, or separately?

Thanks and 73,
Robert (AG6ZZ)

On 2018-04-13 13:23, Cady, Fred wrote:

> Hi Robert,
>
> I'm thinking you could greatly expand your potential market by having two speakers and supporting stereo audio. That way people could use the KX3 dual watch feature without having to plug in headphones. It might also be attractive for K3 users (like me) suffering from a space problem. I use the West Mountain speakers and love them but would like something smaller.
>
> Just a thought.
>
> Good luck.
>
> 73,
>
> Fred KE7X
>
> -------------------------
>
> FROM: [hidden email] <[hidden email]> on behalf of John Gibson <[hidden email]>
> SENT: Friday, April 13, 2018 12:32 PM
> TO: Robert J. Morris; [hidden email]
> SUBJECT: Re: [Elecraft] [KX3] New Product: SPX3 External Speaker
>
> Hi Robert,
>
> Your proposed speaker looks interesting. Thank you for offering it.
>
> My need is a little different. I want to use a KX2 for portable emergency communication, powering it directly from a 12V lithium iron phosphate (LFP) battery. For this application I would like to power an external amplified speaker directly from the same 12V LFP battery. I would be rather not have to recharge an amplified speaker's internal battery.
>
> 73,
> John, no8v
>
> ________________________________________
> From: [hidden email] <[hidden email]> on behalf of Robert J. Morris <[hidden email]>
> Sent: Thursday, April 12, 2018 1:06:25 PM
> To: [hidden email]
> Subject: [Elecraft] [KX3] New Product: SPX3 External Speaker
>
> I've built a prototype powered external speaker for the KX3, and would
> like some feedback on what folks would desire in terms of features, and
> whether folks would want to own one.
>
> The speaker currently is designed to match the overall look of the KX3
> and PX3, and accept similar third-party panels and covers as for the KX
> line. Presently, it uses the same legs and feet as the KX3 and PX3, and
> is the same height and depth as those. There is one USB port for
> charging the internal lithium battery, and input and output stereo
> jacks. The speaker is mono. The output jack redirects the right channel
> from the stereo input for a second speaker, just like with the Elecraft
> SP3 and other similar external speakers. The speaker is amplified.
>
> The SPX3 puts out a maximum of 3W, and is about as loud as any external
> radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
> PHONES jack. There is a built-in low pass filter to reduce noise and
> improve the listening experience.
>
> The prototype, as you'll see in pictures in the links below, is slightly
> narrower than the expected finished product. The speaker driver and
> on/off switch are both waterproof, but - just like the KX3 and PX3 - the
> case isn't. So, don't drop it in a lake. It will handle all conditions
> appropriate for the KX3, and is meant for indoor and outdoor use. Having
> matched the case design so closely to the KX3, it isn't as airtight as
> I'd like it, so the next prototype will have the case halves join in a
> more customary way, but remain the same dimensions and overall look.
> This will also improve ingress protection.
>
> You'll see the speaker is not a polished finished product yet, as it's a
> rough first prototype made by hand. Your feedback will assure the final
> product is what you want gracing your portable shack.
>
> Please note, the KX3 in the photo is only to demonstrate the speaker.
>
> All feedback is welcome. Please let me know which reasonable
> enhancements or simplifications you'd like to see.
> Examples:
> * Would you want an output USB port to use the speaker to charge your
> phone?
> * Would you want to dispense with the built-in battery, and run it
> entirely from external power?
> * Would you want a second passive speaker driven by the first to save on
> weight and cost? That is, a SPX3A (active, with battery, charger, and
> amp) and SPX3P (passive, with only speaker driver)
> * If you're a KX2 user, would you like me to produce the SPX2 (also in
> development)?
>
> Pictures:
> SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
> SPX3 Left Oblique:
> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
> SPX3 Right Oblique:
> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG
>
> 73,
> Robert (AG6ZZ)
>
> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
> J. Morris
> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
> Robert J. Morris
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

Bob N3MNT

Re: [KX3] New Product: SPX3 External Speaker

In reply to this post by Cady, Fred-2

If possible could yu post an audio clip with both SSB and CW.

--
Sent from: http://elecraft.365791.n2.nabble.com/
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Robert J. Morris

Re: [KX3] New Product: SPX3 External Speaker

In reply to this post by Robert J. Morris

I just found the message at the bottom from Bob N3MNT in the online
archive. I don't know why it wasn't emailed to me. Here's my response:

Hi Bob,

Thanks for your inquiry.

The first prototype, though fully functional, is a proof of concept, and
far from the final product. I'm making changes to the amplifier and
enclosure which will alter the sound of the speaker. Also, the speaker
driver may change. So, it's premature to make judgements of its sound
quality. Furthermore, you should be aware that listening to recordings
of audio equipment leaves a lot to be desired. After all, you wouldn't
be listening to the SPX3 itself, but to what was picked up by the
microphone and recording equipment I would have available, then played
back on whatever computer, audio gear, and speakers or headphone you
have on hand. Not only that, what sounds best to you may be different
than what sounds best to someone standing next to you. It would be best
to hear the final product in person.

My endeavor is to create a product that sounds as good as possible to
most listeners within the compromises necessary to get all the features
folks most want in a very small, crowded enclosure and keep the price
reasonable for what folks will be purchasing. Then, improve it as users
provide feedback from how they choose to use it.

Thanks and 73,
Robert (AG6ZZ)

--

Bob N3MNT [1] Fri, 13 Apr 2018 13:59:07 -0700 [2]

If possible could yu post an audio clip with both SSB and CW.

--

Links:
------
[1]
https://www.mail-archive.com/search?l=elecraft@...&q=from:%22Bob+N3MNT%22
[2]
https://www.mail-archive.com/search?l=elecraft@...&q=date:20180413
______________________________________________________________
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Robert J. Morris

Re: [KX3] New Product: SPX3 External Speaker

In reply to this post by Robert J. Morris

I just spotted this in the online archive which wasn't emailed to me. I
apologize in a advance for others who post replies without getting a
response from me. If the list server doesn't send me a copy, I may not
spot it in the archive. The original message is at the bottom. First is
my reply:

Hi Walter,

Thanks for your feedback. I appreciate it. Yes, I'm aware of that
amplifier. It would be appropriate for driving bookshelf HiFi speakers,
as your writeup demonstrates - cool project, by the way. Aside from 15W
being overkill for driving the 2W/3W driver in the SPX3, it wouldn't fit
in the enclosure, and would need to be modified by hand to work as
needed even if it did fit. Most transceiver external speakers put out
2-3W, as that's all that's necessary for listening to voice and CW at
close range. Plus, when taking the SPX3 portable, it needs to last a
long time on a battery. 15W per channel (30W) would drain a battery
mighty quick. I turned the prototype on this morning when I got up, and
it's still running after more than 15 hours on the same battery charge.

The SPX3 sports features specific to what the KX3 needs, such as a low
pass filter, built-in battery and charging circuitry, a shielded
enclosure to eliminate RF from the antenna affecting the audio, works
great outdoors, the speaker cone won't get damaged if it gets wet, and
more. Plus, it matches the KX3 and supports KX panels and covers
(already in talks with the SIDE KX folks). You might want a pair
yourself to take on the road.

Thanks and 73,
Robert (AG6ZZ)

---

Walter Underwood [1] Fri, 13 Apr 2018 11:58:12 -0700 [2]

I use this 12 V audio amp. It would be easy to put it inside a speaker.
It
seems to vary in price a bit. Today it is $8.50, on the low side.

"DROK TDA7297 15W+15W Audio Power Amplifier Module AC/DC 9-18V 2.0 Dual
Channel
Stereo Amp Board"
https://smile.amazon.com/DROK-Amplifier-Amplify-Digital-Portable/dp/B00C4MT274/

At home, I stick it to the top of one of the speakers with velcro.
Writeup is
here:

https://observer.wunderwood.org/2017/03/04/speakers-for-my-elecraft-kx3/

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

Links:
------
[1]
https://www.mail-archive.com/search?l=elecraft@...&q=from:%22Walter+Underwood%22
[2]
https://www.mail-archive.com/search?l=elecraft@...&q=date:20180413
______________________________________________________________
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Post: mailto:[hidden email]

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Robert J. Morris

Re: [KX3] New Product: SPX3 External Speaker

In reply to this post by Robert J. Morris

I just found the message at the bottom from Bob N3MNT in the online
archive. I don't know why it wasn't emailed to me. Here's my response:

Hi Bob,

Thanks for your inquiry.

The first prototype, though fully functional, is a proof of concept, and
far from the final product. I'm making changes to the amplifier and
enclosure which will alter the sound of the speaker. Also, the speaker
driver may change. So, it's premature to make judgements of its sound
quality right now. Furthermore, listening to recordings of audio
equipment leaves a lot to be desired. After all, you wouldn't be
listening to the SPX3 itself, but to what was picked up by the
microphone and recording equipment I would have available, then played
back on whatever computer, audio gear, and speakers or headphone you
have on hand. Not only that, what sounds best to you may be different
than what sounds best to someone standing next to you. It would be best
to hear the final product in person.

My endeavor is to create a product that sounds as good as possible to
most listeners within the compromises necessary to get all the features
folks most want in a very small, crowded enclosure and keep the price
reasonable for what folks will be purchasing. Then, improve it as users
provide feedback from how they choose to use it.

Thanks and 73,
Robert (AG6ZZ)

--

Bob N3MNT Fri, 13 Apr 2018 13:59:07 -0700

If possible could yu post an audio clip with both SSB and CW.

--
______________________________________________________________
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Post: mailto:[hidden email]

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Message delivered to [hidden email]

Robert J. Morris

Re: [KX3] New Product: SPX3 External Speaker

In reply to this post by Paul Van Dyke

I just found the message at the bottom from Bob N3MNT in the online
archive. I don't know why it wasn't emailed to me. Here's my response:

Hi Bob,

Thanks for your inquiry.

The first prototype, though fully functional, is a proof of concept, and
far from the final product. I'm making changes to the amplifier and
enclosure which will alter the sound of the speaker. Also, the speaker
driver may change. So, it's premature to make judgements of its sound
quality right now. Furthermore, listening to recordings of audio
equipment leaves a lot to be desired. After all, you wouldn't be
listening to the SPX3 itself, but to what was picked up by the
microphone and recording equipment I would have available, then played
back on whatever computer, audio gear, and speakers or headphone you
have on hand. Not only that, what sounds best to you may be different
than what sounds best to someone standing next to you. It would be best
to hear the final product in person.

My endeavor is to create a product that sounds as good as possible to
most listeners within the compromises necessary to get all the features
folks most want in a very small, crowded enclosure and keep the price
reasonable for what folks will be purchasing. Then, improve it as users
provide feedback from how they choose to use it.

Thanks and 73,
Robert (AG6ZZ)

--

Bob N3MNT Fri, 13 Apr 2018 13:59:07 -0700

If possible could yu post an audio clip with both SSB and CW.

--
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jh3sif

Re: [KX3] New Product: SPX3 External Speaker

In reply to this post by Robert J. Morris

I would prefer followings;

1. a stereo audio output which can be connected to PC audio input.
2. a VR for changing SP output level without changing KX3/KX2 AF VOL

These are useful to operate digital modes.

73 de JH3SIF, Keith

> 2018/04/13 2:06、Robert J. Morris <[hidden email]>のメール:
>
> I've built a prototype powered external speaker for the KX3, and would
> like some feedback on what folks would desire in terms of features, and
> whether folks would want to own one.
>
> The speaker currently is designed to match the overall look of the KX3
> and PX3, and accept similar third-party panels and covers as for the KX
> line. Presently, it uses the same legs and feet as the KX3 and PX3, and
> is the same height and depth as those. There is one USB port for
> charging the internal lithium battery, and input and output stereo
> jacks. The speaker is mono. The output jack redirects the right channel
> from the stereo input for a second speaker, just like with the Elecraft
> SP3 and other similar external speakers. The speaker is amplified.
>
> The SPX3 puts out a maximum of 3W, and is about as loud as any external
> radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
> PHONES jack. There is a built-in low pass filter to reduce noise and
> improve the listening experience.
>
> The prototype, as you'll see in pictures in the links below, is slightly
> narrower than the expected finished product. The speaker driver and
> on/off switch are both waterproof, but - just like the KX3 and PX3 - the
> case isn't. So, don't drop it in a lake. It will handle all conditions
> appropriate for the KX3, and is meant for indoor and outdoor use. Having
> matched the case design so closely to the KX3, it isn't as airtight as
> I'd like it, so the next prototype will have the case halves join in a
> more customary way, but remain the same dimensions and overall look.
> This will also improve ingress protection.
>
> You'll see the speaker is not a polished finished product yet, as it's a
> rough first prototype made by hand. Your feedback will assure the final
> product is what you want gracing your portable shack.
>
> Please note, the KX3 in the photo is only to demonstrate the speaker.
>
> All feedback is welcome. Please let me know which reasonable
> enhancements or simplifications you'd like to see.
> Examples:
> * Would you want an output USB port to use the speaker to charge your
> phone?
> * Would you want to dispense with the built-in battery, and run it
> entirely from external power?
> * Would you want a second passive speaker driven by the first to save on
> weight and cost? That is, a SPX3A (active, with battery, charger, and
> amp) and SPX3P (passive, with only speaker driver)
> * If you're a KX2 user, would you like me to produce the SPX2 (also in
> development)?
>
> Pictures:
> SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
> SPX3 Left Oblique:
> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
> SPX3 Right Oblique:
> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG
>
> 73,
> Robert (AG6ZZ)
>
> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
> J. Morris
> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
> Robert J. Morris
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

Don Wilhelm

Re: [KX3] New Product: SPX3 External Speaker

Keith,

You can already do that with a simple stereo cable to connect the
KX2/KX3 PHONES jack to your computer soundcard input.

The computer soundcard level can be changed without varying the KX2/KX3
AF gain.

73,
Don W3FPR

On 4/14/2018 9:47 PM, Keith Onishi wrote:

> I would prefer followings;
>
> 1. a stereo audio output which can be connected to PC audio input.
> 2. a VR for changing SP output level without changing KX3/KX2 AF VOL
>
> These are useful to operate digital modes.
>
> 73 de JH3SIF, Keith
>
>> 2018/04/13 2:06、Robert J. Morris <[hidden email]>のメール:
>>
>> I've built a prototype powered external speaker for the KX3, and would
>> like some feedback on what folks would desire in terms of features, and
>> whether folks would want to own one.
>>
>> The speaker currently is designed to match the overall look of the KX3
>> and PX3, and accept similar third-party panels and covers as for the KX
>> line. Presently, it uses the same legs and feet as the KX3 and PX3, and
>> is the same height and depth as those. There is one USB port for
>> charging the internal lithium battery, and input and output stereo
>> jacks. The speaker is mono. The output jack redirects the right channel
>> from the stereo input for a second speaker, just like with the Elecraft
>> SP3 and other similar external speakers. The speaker is amplified.
>>
>> The SPX3 puts out a maximum of 3W, and is about as loud as any external
>> radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
>> PHONES jack. There is a built-in low pass filter to reduce noise and
>> improve the listening experience.
>>
>> The prototype, as you'll see in pictures in the links below, is slightly
>> narrower than the expected finished product. The speaker driver and
>> on/off switch are both waterproof, but - just like the KX3 and PX3 - the
>> case isn't. So, don't drop it in a lake. It will handle all conditions
>> appropriate for the KX3, and is meant for indoor and outdoor use. Having
>> matched the case design so closely to the KX3, it isn't as airtight as
>> I'd like it, so the next prototype will have the case halves join in a
>> more customary way, but remain the same dimensions and overall look.
>> This will also improve ingress protection.
>>
>> You'll see the speaker is not a polished finished product yet, as it's a
>> rough first prototype made by hand. Your feedback will assure the final
>> product is what you want gracing your portable shack.
>>
>> Please note, the KX3 in the photo is only to demonstrate the speaker.
>>
>> All feedback is welcome. Please let me know which reasonable
>> enhancements or simplifications you'd like to see.
>> Examples:
>> * Would you want an output USB port to use the speaker to charge your
>> phone?
>> * Would you want to dispense with the built-in battery, and run it
>> entirely from external power?
>> * Would you want a second passive speaker driven by the first to save on
>> weight and cost? That is, a SPX3A (active, with battery, charger, and
>> amp) and SPX3P (passive, with only speaker driver)
>> * If you're a KX2 user, would you like me to produce the SPX2 (also in
>> development)?
>>
>> Pictures:
>> SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
>> SPX3 Left Oblique:
>> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
>> SPX3 Right Oblique:
>> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG
>>
>> 73,
>> Robert (AG6ZZ)
>>
>> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
>> J. Morris
>> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
>> Robert J. Morris
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Mark Wheeler

Re: [KX3] New Product: SPX3 External Speaker

In reply to this post by Robert J. Morris

Robert,

I really like the idea of a matching active and passive speaker set for the KX3; I’d be very interested in having one active one, with an internal rechargeable battery, and one passive one. Having a USB on the side for additional functionality is also very desirable. Thanks for considering.

73, Mark
KM6HFR
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Robert J. Morris

Re: [KX3] New Product: SPX3 External Speaker

In reply to this post by Robert J. Morris

First of all, I want to say thanks to everyone for all the great
feedback I've been getting on the speaker. Here's are some requested
features:

1. One stereo channel to speaker driver and another channel to output
jack (already in first prototype)

2. 12V input (planned is 9-15V, like the KX3)

3. Separate powered (active) and unpowered (passive) speakers
The reasons I've gotten for this is that it would save on the weight of
and inconvenience of charging a second battery

4. Separate volume controls for the internal speaker driver and the
output jack
The reason I've gotten for this is that a computer will need the volume
set separately from the speaker.
Some have stated the computer's software can adjust the gain on the
input, and that there only needs to be one volume control for the
speaker driver. I'll need consensus on this from the digital mode folks.

5. USB power output
This would be convenient for those who wish to use their speakers as
phone chargers.

Things to consider:

A. Making two different speakers substantially increases manufacturing
costs for the most expensive part; the enclosure. Since most folks will
be fine with just one speaker, then the lower production numbers of the
passive speaker would make its per unit cost much higher than the active
one. However, folks would expect a lower price on the passive one. So,
I'd have to sell them as pairs to justify manufacturing the passive
ones, which would mean a higher cost to consumers who only want the
active one. It would also increase the cost to those who want both
because of the two different enclosures instead of just one enclosure
twice.

B. The one issue which would force making both an active and a passive
speaker is the need stated by some respondents that the active one would
require a second volume control for the output to the computer for
digital modes. It would be expensive and time consuming for me to try
every digital mode software on every operating system, so I need
confirmation whether this is truly necessary.

C. If a second volume control is not truly necessary, then that
simplifies things tremendously. I'll wait for consensus on this before
going into why.

D. A USB power output port is beyond the scope of the speaker's intended
utility. Also, it would draw down the battery at the cost of
significantly limiting how long the speaker could be used before needing
a recharge. Furthermore, the extra hole and port would increase the cost
while reducing ingress protection. Lastly, there's not much room in the
small enclosure to accomodate nonessential items.

Thanks and 73,
Robert (AG6ZZ)
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Don Wilhelm

Re: [KX3] New Product: SPX3 External Speaker

Robert,

You will need to provide a means of connecting the KX2/KX3 PHONES output
to a soundcard for the use of digital modes.

The KXSPA should connect to the left channel since that is the channel
that is normally used by soundcard digital.

I think that means you would want to provide a knob controlled gain
control on your active speaker so the sound level to the speakers can be
controlled without disturbing the level to the soundcard being used for
digital modes.

73,
Don W3FPR

On 4/15/2018 11:40 PM, Robert Morris wrote:

> First of all, I want to say thanks to everyone for all the great
> feedback I've been getting on the speaker. Here's are some requested
> features:
>
> 1. One stereo channel to speaker driver and another channel to output
> jack (already in first prototype)
>
> 2. 12V input (planned is 9-15V, like the KX3)
>
> 3. Separate powered (active) and unpowered (passive) speakers
> The reasons I've gotten for this is that it would save on the weight of
> and inconvenience of charging a second battery
>
> 4. Separate volume controls for the internal speaker driver and the
> output jack
> The reason I've gotten for this is that a computer will need the volume
> set separately from the speaker.
> Some have stated the computer's software can adjust the gain on the
> input, and that there only needs to be one volume control for the
> speaker driver. I'll need consensus on this from the digital mode folks.
>
> 5. USB power output
> This would be convenient for those who wish to use their speakers as
> phone chargers.
>
> Things to consider:
>
> A. Making two different speakers substantially increases manufacturing
> costs for the most expensive part; the enclosure. Since most folks will
> be fine with just one speaker, then the lower production numbers of the
> passive speaker would make its per unit cost much higher than the active
> one. However, folks would expect a lower price on the passive one. So,
> I'd have to sell them as pairs to justify manufacturing the passive
> ones, which would mean a higher cost to consumers who only want the
> active one. It would also increase the cost to those who want both
> because of the two different enclosures instead of just one enclosure
> twice.
>
> B. The one issue which would force making both an active and a passive
> speaker is the need stated by some respondents that the active one would
> require a second volume control for the output to the computer for
> digital modes. It would be expensive and time consuming for me to try
> every digital mode software on every operating system, so I need
> confirmation whether this is truly necessary.
>
> C. If a second volume control is not truly necessary, then that
> simplifies things tremendously. I'll wait for consensus on this before
> going into why.
>
> D. A USB power output port is beyond the scope of the speaker's intended
> utility. Also, it would draw down the battery at the cost of
> significantly limiting how long the speaker could be used before needing
> a recharge. Furthermore, the extra hole and port would increase the cost
> while reducing ingress protection. Lastly, there's not much room in the
> small enclosure to accomodate nonessential items.
>
> Thanks and 73,
> Robert (AG6ZZ)
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

Robert J. Morris

Re: [KX3] New Product: SPX3 External Speaker

Hi Don,

Thanks for your feedback. I'm hoping one volume knob will do the job for
everyone else too. Plus, if the KX3 puts out enough signal for the PC,
then you don't really want an amplifier in the signal path.

I want to be sure about the channel which needs to go to the sound card.
Are you saying the left channel from the KX3 is the one the computer
needs, or are you saying the computer needs the signal to be present on
the left channel of its input? If it's the latter, then that is already
how the SPX3 is wired.

For the first prototype, the stereo output of the KX3 goes into the SPX3
input port, then is split. The left channel goes to the amplifier, and
the right goes to the left channel of the output port. Will that do the
job, or does the computer really need the signal which originated from
the left channel of the KX3? I don't see in the KX3 manual where it
specifies which channel the digital mode signal is output. I had assumed
it would be on both left and right channels.

Thanks and 73,
Robert (AG6ZZ)

On 2018-04-15 21:24, Don Wilhelm wrote:

> Robert,
>
> You will need to provide a means of connecting the KX2/KX3 PHONES output to a soundcard for the use of digital modes.
>
> The KXSPA should connect to the left channel since that is the channel that is normally used by soundcard digital.
>
> I think that means you would want to provide a knob controlled gain control on your active speaker so the sound level to the speakers can be controlled without disturbing the level to the soundcard being used for digital modes.
>
> 73,
> Don W3FPR
>
> On 4/15/2018 11:40 PM, Robert Morris wrote:
>
>> First of all, I want to say thanks to everyone for all the great feedback I've been getting on the speaker. Here's are some requested features:
>>
>> 1. One stereo channel to speaker driver and another channel to output jack (already in first prototype)
>>
>> 2. 12V input (planned is 9-15V, like the KX3)
>>
>> 3. Separate powered (active) and unpowered (passive) speakers
>> The reasons I've gotten for this is that it would save on the weight of and inconvenience of charging a second battery
>>
>> 4. Separate volume controls for the internal speaker driver and the output jack
>> The reason I've gotten for this is that a computer will need the volume set separately from the speaker.
>> Some have stated the computer's software can adjust the gain on the input, and that there only needs to be one volume control for the speaker driver. I'll need consensus on this from the digital mode folks.
>>
>> 5. USB power output
>> This would be convenient for those who wish to use their speakers as phone chargers.
>>
>> Things to consider:
>>
>> A. Making two different speakers substantially increases manufacturing costs for the most expensive part; the enclosure. Since most folks will be fine with just one speaker, then the lower production numbers of the passive speaker would make its per unit cost much higher than the active one. However, folks would expect a lower price on the passive one. So, I'd have to sell them as pairs to justify manufacturing the passive ones, which would mean a higher cost to consumers who only want the active one. It would also increase the cost to those who want both because of the two different enclosures instead of just one enclosure twice.
>>
>> B. The one issue which would force making both an active and a passive speaker is the need stated by some respondents that the active one would require a second volume control for the output to the computer for digital modes. It would be expensive and time consuming for me to try every digital mode software on every operating system, so I need confirmation whether this is truly necessary.
>>
>> C. If a second volume control is not truly necessary, then that simplifies things tremendously. I'll wait for consensus on this before going into why.
>>
>> D. A USB power output port is beyond the scope of the speaker's intended utility. Also, it would draw down the battery at the cost of significantly limiting how long the speaker could be used before needing a recharge. Furthermore, the extra hole and port would increase the cost while reducing ingress protection. Lastly, there's not much room in the small enclosure to accomodate nonessential items.
>>
>> Thanks and 73,
>> Robert (AG6ZZ)
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]