I have read lots of thread with some really good advice and knowledge. Still a tad confused about what I can and can't do. I have the Concert stereo with Bose in my 2003 S4 Avant. The bass gets lost in the cavernous boot space. I am ok with the HU (for the minute!) and ok with the sound of the fronts and rears (for the minute!) I have a V12 amp and a 10" sub box from a previous install that I would like the use. I appreciate that I will have to run power to the boot - I'll go through that world of pain once I figure out what I am doing!! My question: Is it possible to split out the input "feed" for the sub to run to my external amp, BUT, still leave the other "feeds" to the existing Bose amp to run the rears etc? Basically, want to do as little as possible to get some more bass into my car and have a spare V12 and sub around. Thanks all!