Originally Posted by Hiroska

Your rear speakers dont have any bass, when you hook subs up, your bass is then all transmitted to your subs, not your factory speakers. The factory amp is bypassed using the harness, so no the factory amp removal wouldnt help. I would suggest if its too much...

A) smaller subwoofer
B) better amp w/ better settings to adjust
c) remove factory head unit & replace with aftermarket
d) dont use subs, sell your stuff, buy a 4 channel amp, get after market speakers, and plug and play, plenty bass and better sound than factory without the boom.
E) turn your treble up, and bass low, adjust settings.

Or F....And replace all factory stuff, smaller subs w/ better amp for an outstanding system. Try a sealed box, they usually uphold less bass w/ small amps. If you need help free to pm me.