Speakers thump when doing ANYTHING

J_Martin Bronze Member Username: Jmartin2323 Cleveland, Ohio United States Post Number: 50 Registered: Mar-10	Posted on Sunday, July 04, 2010 - 21:43 GMT this isnt my car specifically but ive been asked to fix the prob. when he turns on the radio THUMP. turns off the radio THUMP. turns volume from 0 to 1 THUMP. hes got a couple amps, decent install. pioneer HU. any suggestions on what this may be?
Matt Silver Member Username: M_kimmel843 Post Number: 141 Registered: Apr-10	Posted on Thursday, July 08, 2010 - 13:57 GMT Check the ground connections, sounds like you have a very bad ground loop.
sean Platinum Member Username: Insearchofbass 2 hifonics 2607s, 2dcSounds12xls SPL\idmax12SQ Post Number: 14544 Registered: Jun-04	Posted on Friday, July 09, 2010 - 17:40 GMT x2