Hi all. I have a 2008 A4 Avant S Line SE with RNS-e and BOSE. The sound is ok, but the sub is a little lost in the vast boot of the Avant. Is there a way of taking a feed from the head unit and pointing it towards an external amp (Alpine V12) and sub (AudioBahn)...? I want to take the signal before it gets into the amp, therefore (presuming) it will be the cleanest - then stick some RCA cables on. I have seen amps that will take in the speaker cable direct - I expect those to be crappy quality and probably get hot. Is this doable or am I make a rod for my own back and will end up in a big heap or wires/fire/anger?! Thanks all.