OK so, first found answer was make sure both grounds (which ones? Not sure at all) are actually grounded. Diversity or not, it can play havic with both AM and FM. This explains why AM was snuffed and FM was hardly bearable.
Now, guess that leaves why existing factory JBL amp can't drive...
So, Eclipse recommended installer for the AVN5495 has trouble recognizing how to interface system with factory wiring for JBL 7 + subwoofer speaker and diversity antenna system. I don't get AM, FM is shottie, 107.7, 107.3, 88.5, etc. get hammered where with my factory installed JBL system...
