05 chrysler 300c srt8 audio wiring help please

[minithis]

We have replaced the spkrs, and added in a 4ch and mono amps off the oem headunit/nav, using line out adaptors after the oem amplifer. We are having problem with interference and sound quality mainly through the rear spkrs. If anyone has worked on or know anything that may help please respond asap. Thanks in advance.

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[XtrmAudioCncpts 10+ year member]

your problem is that you kep the factory amp you need to put your line outs before you factory amp. factory amps cause too many problems that why i will never buy a up graded factory stereo