I installed a system for my friend and it did that too. He was using a BD series RF amp with soft turn off and Monster Cable RCA's. His would do it when you turn it on, off, and whenever he changed the radio station or CD.
whats ur head unit pioneer??? my friend does that to he has a powerbass and and hits at the end when he turns off the car too, and his amp is a jl 1000/1 i think it is the head unit.
like the beeping from the head unit of a pioner when u shut it off (mine does that), i think the bass does that maybe also
lol, what kind of amp is it?? the problem is actually the amplifier 90% of the time...
example my prd1000.1 gave a loud boom, when turn the key straight off.. the boom is the extra voltage on the amplifiers voltage rails leaking out of the capacitors to the subs..
my 2 2500ds do not give me that boom!!
you can wire a relay to the remote wire, to fix this problem..