annoying whine sound from speakers (Mr2)

The speaker was fine when it was connected to the headunit.

The whine sound has started since i've amped it up using MTX 4244 (no problem on my old car), it start when the engine started...it sometimes stop whine for a few sec, however as soon as i put into first gear.. it starts whine agian..

For more information, it does not changes pitch when rev and i mount it at the back of the passanger seat. (quite near to the engine)

help~~~

thanks for your reply.

Ground is fixed direct to the chassic

I've tried to varies the gain, no help even on zero gain

speaker wires and RCA are connected properly..

I'm running all wire in the same route... is that the problem, but it on occurs when the engine starts

Are you using an LOC?  If so, replace it first as those tend to be very prone to picking up induced noise.

Other things that can cause this problem include faulty ignition wiring somewhere in your engine compartment. A bad Coil, cracked distributor cap or spark plug, bad plug wire, plug wires not being supression type, etc.  This can be very, very difficult to find.  Try moving the amp away from the engine compartment and see if it helps.

sorry... what is a LOC?

I've just found out it changes pitch when i steer the steering....it must be the power steering is playing up....

any suggestion?

That right there could be your prob... trying running the power alone... with the rca's as far aways as possible...