Where do I put the subwoofer volume control potentiometer?

[TheLaw117]

Hi guys,

I'm building a 2.1 system. I'd like to have control over the power of the sub. Where do I put the pot? I have 2 boards that make up the sub portion. A preamp board and the actual power amp board. Do I put it even before the preamp board?

Thanks.

 

[richie00boy]

I would imagine that the pre-amp board provides the filtered signal for the sub, therefore if you want to adjust the sub level the pot must go after that.

 

[TheLaw117]

Here's the board: Subwoofer (12HZ-48HZ)+(28HZ-112HZ) preamplifier board | eBay

It seems like it has adjustable filters. Like a mixer...

So in between the preamp and the power amp? How do I know what value to use? 10K?

Thanks a lot.

 

[richie00boy]

I don't know how they do it... I couldn't even buy the parts for that price.

Yes 10k log should be ok, depends on the input impedance of your amp.

 

[TheLaw117]

Input is going to be my PC...So not sure what that means, but I'll go with 10K.

And yeah no idea how they can do that for roughly $15 w/ shipping. Its not even like they are buying/selling in crazy bulk either.

Thanks.