smartinup

i can 100% confirm that it is the AMP that is causing the bass to cut out. Part number (7L2T-18C808-AA). The problem is on the circuit board of the AMP. The capacitors solder is usually deteriorated over the years, if you have access to a soldering iron or knows some who does i recommend touching up the solder on the capacitors. I myself am no expert at soldering but i was able to fix the problem without paying for a new AMP. it took about an hour and its not rocket science. i learned this from patpend on this forum https://www.f150forum.com/f75/how-fix-your-subwoofer-amplifier-7l2t-18c808-aa-227544/. He shows you exactly where to solder.