I have the amp bypass harness from Crutchfield. However, when I got my stereo installed, I did not have the harness installed. They stated that whenever they do a system where there's a factory amp, they use it. It seems to sounds fine. I have a Sony CDX-M620. I've heard the amps in Sony HU's aren't especially good and that's part of the reason for using the factory amp. Will I truly get better sound by bypassing it?
