i have a kenwood excelon head unit, two JL 10W3s powered by a phoenix gold zx600ti. i had it professionally installed with very good wires.

why the hell are my subs thumping, buzzing, and humming periodically. it has no pattern. everyone ive talked to say its my amp, but my amp isnt very old and its a great amp. has anyone had any problems like this or can anyone give me advice on what to do...thanks