"Simoc" wrote in message

Take a signal from them, filter out the higher frequencies, and amplify
it to suitable for the subW.

Well, the line input is in the subW, from which it normally goes to the L&R
speakers. The amp is really in the subW, only the controls are normally in
the L&R speakers (well one of them).

With a schematic, I might be able to do some surgery :-)

RichK