OT Slightly K3s and Studio Mixer

[Rich-4]

I am interested in using a studio mixer so I can use a single mic with
two K3s.

The mixer output impedance is 150ohms and the K3 mic input is looking
for 600ohms.

I have seen several articles using studio mixers with two radios but
none mention using an audio transformer to correct the miss match.

Should I not be concerned about the difference in impedance?

Do anyone have a recommendation on a device to match the the impedances?

Thanks

Rich

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[Bill Steffey NY9H]

check out used RDL  ( radio design labs)  products in the 'bay"... build
out exactly what you want ..


RDL-Radio-Design-Labs-STM-2-Adj-Gain-Microphone-Preamplifier-35-65-dB-Gain....


a whole range of appropriate products,,


On 7/3/2020 9:07 AM, Rich wrote:

> I am interested in using a studio mixer so I can use a single mic with
> two K3s.
>
> The mixer output impedance is 150ohms and the K3 mic input is looking
> for 600ohms.
>
> I have seen several articles using studio mixers with two radios but
> none mention using an audio transformer to correct the miss match.
>
> Should I not be concerned about the difference in impedance?
>
> Do anyone have a recommendation on a device to match the the impedances?
>
> Thanks
>
> Rich
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> 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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[Don Wilhelm]

Rich,

Don't worry about any mismatch and all will be fine.
The audio world has not matched impedances since the old days of tubes.
Typically a low impedance source is used to drive a high impedance op
amp input.

73,
Don W3FPR

On 7/3/2020 9:07 AM, Rich wrote:

> I am interested in using a studio mixer so I can use a single mic with
> two K3s.
>
> The mixer output impedance is 150ohms and the K3 mic input is looking
> for 600ohms.
>
> I have seen several articles using studio mixers with two radios but
> none mention using an audio transformer to correct the miss match.
>
> Should I not be concerned about the difference in impedance?
>
> Do anyone have a recommendation on a device to match the the impedances?

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Home: http://mailman.qth.net/mailman/listinfo/elecraft
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[Joe Subich, W4TV-4]

 > Should I not be concerned about the difference in impedance?

No.  Modern audio system design calls for outputs to have very
low impedance (essentially a current source) with inputs having
relatively high impedance (high sensitivity).  You will be fine
with the 150 Ohm source driving a 600 Ohm load.

73,

    ... Joe, W4TV


On 2020-07-03 9:07 AM, Rich wrote:

> I am interested in using a studio mixer so I can use a single mic with
> two K3s.
>
> The mixer output impedance is 150ohms and the K3 mic input is looking
> for 600ohms.
>
> I have seen several articles using studio mixers with two radios but
> none mention using an audio transformer to correct the miss match.
>
> Should I not be concerned about the difference in impedance?
>
> Do anyone have a recommendation on a device to match the the impedances?
>
> Thanks
>
> Rich
>

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[Wes Stewart-2]

Low Z = voltage source.

On 7/3/2020 9:54 AM, Joe Subich, W4TV wrote:

>
> > Should I not be concerned about the difference in impedance?
>
> No.  Modern audio system design calls for outputs to have very
> low impedance (essentially a current source) with inputs having
> relatively high impedance (high sensitivity).  You will be fine
> with the 150 Ohm source driving a 600 Ohm load.
>
> 73,
>
>    ... Joe, W4TV

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[Jim Brown-10]

On 7/3/2020 6:07 AM, Rich wrote:
> Should I not be concerned about the difference in impedance?

You should NOT be concerned. You SHOULD be concerned about Pin One
Problems, which make the mixers prone to RFI. Mackie and Rane built
after about 1998 should be free of this mfg defect.

73, Jim K9YC

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