Now I know I've said time and again I'm happy with the standard audio on my car... well, I have an old alpine head unit (not going to use this) along with an alpine sub-amp and passive subwoofer that I'm considering popping in the boot. Its not a huge thing so I don't think its going to compromise boot space too much. My question is, does anyone have any wiring diagrams etc that show where I might tap into line level audio outs? I can if required tap into the speakers and feed the amp that way, but given each speaker seems to be attenuated in some way, this could be a bad idea. If I can find line level outs from the headunit I can feed the sub amp directly. Bonus is that with the battery in the boot, my wiring should be minimal.