[MOSFET]

What HU are you using? Are you using line-level RCA inputs or speaker-level
inputs? So both amps do EXACTLY the same thing? Do they each have seperate
inputs from the HU (like front and rear)? In other words, are you Y-ing a
signal and then sending that to the amps or do they each have their own
seperate inputs from the HU?

If you are sending a front signal to the 3548 and then a rear to the 3522
(I've used that amp, it's a GREAT little amp), is each amp doing EXACTLY the
same thing? If so, it's safe to assume that the problem is related to your
HU or how you have your HU connected to the amps, not the amps themselves.
But we need a bit more info first before we can narrow the problem down.

MOSFET

"headrott" wrote in message
oups.com...
I am installing 2 (2 channel, obviously) amps (an alpine 3548(for the
front) and an alpine 3522 (for the rear)into my car (1993 BMW 318is). I
have the positive cables hooked directly to the battery and and the
ground cables grounded to the floorboard.
The problem is that when I turn on the HU, the amps power up fine but
when I go to turn up the volume (from 0) there is a loud thump on all 4
speakers and the audio that comes out is very weak (even when you turn
it up loud). Also, sometimes on the back speakers (comming from the
3522) the speakers make a constant very fast thump-thump-thump-thump.
The volume of this is a medium volume even when the volume on the HU is
only on 1 or 2. I have tried messing with the ground wires multiple
times, but with no luck. I am at my knowledges end, so please someone
help me figure this out. Tank you for your time and help.