K3 External Speakers

[John Dziedziejko]

I am thinking of purchasing the Bose Companion 2 Series II Multimedia
Speakers for my K3. Is anyone using them and how good do they work? Is there
any RF getting into the speakers?

My best to all.

Regards,

John W9QP


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[Rose]

John,

FWIW, my West Mountain Radio COMspkr set totally free of interference.
The unit with the amp is immediately beside a 1KW amp and the antenna
cables for several rigs pass within inches behind the unit(s).

73! de Ken Kopp - K0PP
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[Phil Hystad-3]

I also have the West Mountain Radio COMspkr and agree it is absolutely clear and free of interference.  If I turn on my external computer speakers (creature speakers hooked to my iMac) then I can hear a loud buzz whenever I key down from those creature speakers but absolutely nothing from the COMspkr.

Highly recommended -- and, they are just the right size to sit in front of you without taking up a lot of room.

73, phil, K7PEH


On Jan 5, 2012, at 8:38 AM, Rose wrote:

> John,
>
> FWIW, my West Mountain Radio COMspkr set totally free of interference.
> The unit with the amp is immediately beside a 1KW amp and the antenna
> cables for several rigs pass within inches behind the unit(s).
>
> 73! de Ken Kopp - K0PP
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

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[Jim Brown-10]

On 1/5/2012 8:38 AM, Rose wrote:
> FWIW, my West Mountain Radio COMspkr set totally free of interference.
> The unit with the amp is immediately beside a 1KW amp and the antenna
> cables for several rigs pass within inches behind the unit(s).

What matters for RFI is proximity to ANTENNAS, not rigs, amplifiers, or
even coax feedlines.

99.9% of all powered speakers suffer from RFI, including those from pro
audio companies. It's good to hear that these do not.

73, Jim K9YC
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[Joe Subich, W4TV-4]

> 99.9% of all powered speakers suffer from RFI, including those from
> pro audio companies. It's good to hear that these do not.

The odd thing is that the COMSpkr appears to be the same device as many
of the generic computer speakers *except* the bypass/RFI suppression
parts included on the chip makers reference design are present in the
West Mountain Radio product but are lacking in the commodity products.

I have "cleaned up" several of the generic ($20) speakers by adding the
necessary parts to the holes *already present* on the circuit board!

73,

    ... Joe, W4TV


On 1/5/2012 11:58 AM, Jim Brown wrote:

> On 1/5/2012 8:38 AM, Rose wrote:
>> FWIW, my West Mountain Radio COMspkr set totally free of interference.
>> The unit with the amp is immediately beside a 1KW amp and the antenna
>> cables for several rigs pass within inches behind the unit(s).
>
> What matters for RFI is proximity to ANTENNAS, not rigs, amplifiers, or
> even coax feedlines.
>
> 99.9% of all powered speakers suffer from RFI, including those from pro
> audio companies. It's good to hear that these do not.
>
> 73, Jim K9YC
> ______________________________________________________________
> 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
>

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[Jim Brown-10]

On 1/5/2012 9:26 AM, Joe Subich, W4TV wrote:
> The odd thing is that the COMSpkr appears to be the same device as many
> of the generic computer speakers*except*  the bypass/RFI suppression
> parts included on the chip makers reference design are present in the
> West Mountain Radio product but are lacking in the commodity products.

Those working professionally in the field of EMC (that is, RFI
interference) know that this sort of problem is QUITE widespread. In
most manufacturing companies, there is an engineer whose job it is to
try to remove as many parts as possible from every product so that it
can be made more cheaply and still be sold. RFI suppression components
almost always the first to go.  Open up a noisy product (if you can) and
you'll find empty holes on  the board where those parts should be.  The
only time those holes are every filled is when the prototype is
submitted for EMC testing.

73, Jim Brown K9YC
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[W5RDW]

Ditto on the West Mountain Radio COMspkr. Ordered a pair after reading reviews here on the forum and after installation, it took about 5 seconds to hear the difference over my computer speakers. My other speakers had RFI on certain bands, but these have no RFI on all the HF bands with the KPA500 running 500 watts. I am extremely satisfied. They are nice looking and have enough of a base area that they will not tip over easily unless actually pushed over. I am pleased. BTW, they arrived within a week of ordering them on-line.

Roger W5RDW