I have recently installed a JVC AVX840 stereo in my car with an Alpine MRP F300 Amplifier and a pair of Alpine SPR-17S component speakers.

Tech Info:

JVC = 3 x 4v pre outs
AMP = 150W RMS x 2 in Bridged Mode @ 4 Ohms
Speakers = 330W each

The whole setup is now working fine however when I turn the system on without anything playing, I can hear a clear buzzing/ distortion noise coming from the speakers.

I've followed all the basic rules of setting up an amp and wiring locations and I have also properly grounded the amp to a clear metal spot in the boot. All the connections are solid and properly sealed with heat shrink tubing as well.

One thing I am not sure of is how to properly tune an amp.

At the moment I have the gains turned up about 2 thirds of the way but still need to play around with it.

Any suggestions or tips would be greatly appreciated. I was thinking of taking it down to an audio specialist but I'm not sure of charges and procedures. If I can have a go at sorting it myself first that would be great.

Thanks!