i was able to turn the gain on my Rockford Fosgate Power T400X2ad amp all the way up with my OEM head unit, but now that i switched to a aftermarket head unit (KW-M595BT) the left channel of the amp clips, regardless of wether it’s the right or left side rca cable plugged into it. i’ve gotten 2 more of these amps to see if the original amp had just broken, but the issue persists.