Unfortunately I blew a speaker last night on my way back from work. Rather than replace the speaker for a standard one, iv been thinking about the possibility of replacing the factory speakers for decent component speakers. My plans are below, but want to make sure it all makes sense to yourselves (its been a while since I played around with ICE). I'm wanting to keep the Audi Symphony head unit - I upgraded from the Symphony II to a Symphony II+ from a 2008 B7 model (which increased sound quality, added MP3 functionality.etc) Would I see gains from just replacing the standard speakers at the front and rear using the existing outputs from the Symphony head-unit, or is there no point unless I add an amp for the new speakers? - I'm thinking about a decent set of Alpine or Focal components. Before the speaker blew I was thinking about replacing the standard subwoofer by taking the current high level inputs and adding a 12" subwoofer via an additional amp. My budget is around £350 max - any thoughts? Cheers!