Re: Running amp through back speakers
Better off with a new head unit... But if you are dead set on not getting one, you have to use a line-out converter (LOC). You crimp the LOC onto the speaker wires. It shouldn't affect the sound you hear coming from the rear speakers, either.
SoundQubed 6.5 Pro's DD T2 Tweeters / Phoenix Gold Xenon 100.4
FI SP4 15 D1 w/ Tantric Sounds softies / DC 5.0K
Singer 310 6 phase 2 runs of Monster Cable 1/0 / Exide g78 AGM under hood and XS D3100 in rear
Plenty of deadener on roof, trunk, doors