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Author Topic: Resistors on Mic Inputs  (Read 572 times)

Jordan Wolf

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Resistors on Mic Inputs
« on: February 01, 2017, 10:42:55 am »

Hey Everyone,

I've been investigating some wall patch panels from an old FSR system install that's been replaced with a Soundweb/Crestron setup.

Old system signal flow was as follows:

Wall patches->Patchbay->Rack mixer->Patchbay->FSR->Patchbay->Amp

All of the Mic input jacks on the wall patch panels have a 1.6k-Ohm resistor between pins 2 and 3.

I am wondering what the rationale behind this might be?


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John Roberts {JR}

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Re: Resistors on Mic Inputs
« Reply #1 on: February 01, 2017, 10:56:38 am »

That is done to reduce noise, when no mics are plugged in.

In dedicated fixed instal mixer/preamp designs, these terminations are often built in. Using non-install gear in an install application could benefit from such noise mitigation.

JR
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Jordan Wolf

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Re: Resistors on Mic Inputs
« Reply #2 on: February 01, 2017, 12:05:15 pm »

Ah, I see. Thanks for the insight!


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"We want our sound to go into the soul of the audience, and see if it can awaken some little thing in their minds... Cause there are so many sleeping people." - Jimi Hendrix
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