How can I use a subwoofer with my PC speakers?
 

I'm using a little class T amp to drive some bookshelf speakers off of a Mac mini. I just split the mini-jack connector into two RCA's and run it into the amp then out to the speakers.

The back of the amp looks like this:
http://p.lefux.com/61/20100220/A1772...plifier_18.jpg

It sounds decent but it could use some low end. I also have a weird old Kenwood subwoofer that I would like to add to the system. It is powered and has a single RCA as an input.

It looks like this:
http://i1.lelong.com.my/UserImages/I.../kuewwai@5.jpg

How can I add my existing sub to the system on the cheap?

The Kenwood manual says you are supposed to use the "supplied adapter" which is probably a filter.

Ahh. I see that now. I bought this thing used a decade ago so I didn't get the adapter. Does anyone know of something aftermarket that would do the same thing?

http://i.imgur.com/xAs3p.jpg

You could use something like this to replace the "adapter"

Amazon.com: Planet Audio PEQ10 4 Band Graphic Equalizer Subwoofer Output with Adjustable Crossover: Car Electronics