simple pre amp volume control with seperate mono out

[Rob B]

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?

 

[gmphadte]

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

 

[Rob B]

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.

 

[gmphadte]

Yes.
This is the simplest method.

Gajanan Phadte

 

[Rob B]

cool, how much resistance is necessarily? My sub amp has an input of 33k.

 

[gmphadte]

Minimum should be about 2K2, max no limit

Gajanan Phadte