I recently came accross this thread that details on how to replace the existing sub woofer on a B7 A4:

http://www.audizine.com/forum/showth...ock-sub-woofer

I have a non-bose system with an RNS-E (originally a Symphony II) and I wanted to know if it was possible to replace the existing sub with something like a Pioneer TS-SW841D without installing a new amp (essentially using the same wiring that is already driving the current sub). I'm somewhat new to car audio upgrades, so I apologize in advance if this is a dumb question.

Thanks!