humming

I jist got a surge 2k 4 channel amp off of ebay. Every piece of equipment i own is brand new but decided to pull the trigger on this amp bc i got a good deal on it. When i plug it in theres a humming coming from inside the amp. It powers up and everything seems to work. Anyone have anyclue what...

hey guys, everytime I crank my truck my subwoofer starts to hum, sometimes it is louder than other times but when I just turn on the truck, without starting the engine, it doesn't hum, I have changed out the ground wires plenty of times thinking it was it any clue on why it is doing it, I have a...

HELP ME fix the Humming...See my forum post.

HELP ME fix the Humming...See my forum post.

I've been reseaching about why subs hum, and I've tried pretty much everything I've read, except things like LOC and Ground-loop isolator. I traded someone in my family cash for an audio system out of a Ford Ranger.(Maybe it was damaged or dropped is the problem???) I put it in my 98 Sable, so...