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Old 5th February 2013, 12:40 AM   #1
Rob B is offline Rob B  United States
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Default simple pre amp volume control with seperate mono out

Hi all, I have a bit of a noob question. I'm trying to build a simple pre amp volume control consisting of a main volume control stereo pot, and a secondary volume pot tied to the output of my main pot. The part that hangs me up is I want the second pot to be mono, basically a sub out from my main volume control. If I mono up the second pot it would make my entire low level circuit (rca's) mono, is there any simple circuit that would solve this?
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Old 5th February 2013, 06:11 AM   #2
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You have to connect two resistors (value in Kohms)in series with the two outputs, to the input of the single pot. However, if your subamp has no low pass filter, you will have to construct one.

Gajanan Phadte
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Old 5th February 2013, 10:09 PM   #3
Rob B is offline Rob B  United States
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So your saying just some resistors wont allow my second mono circuit to "backfeed" if you will into my rca path?


I'm using a simple passive crossover on the sub.
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Old 7th February 2013, 03:39 AM   #4
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Yes.
This is the simplest method.

Gajanan Phadte
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Old 7th February 2013, 10:11 PM   #5
Rob B is offline Rob B  United States
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cool, how much resistance is necessarily? My sub amp has an input of 33k.
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Old 8th February 2013, 03:41 AM   #6
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Minimum should be about 2K2, max no limit

Gajanan Phadte
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