Buzzing sound

[kkkd]

I have a kenwood mp538u head unit and a crunch p900.4 amp hooked to rockford p162c's in the door and sony xplod 6x9's behind the seat. I also have 2 10" rockford subs behind the seat and an amp too. Anyways the front speakers make a horible buzzing/whinning sound when the pickup is running even when the volume is completely down. but the rear speakers and subs are fine. The Head unit is completely surrounded in a metal installation plate... So I don't even have to hook up the ground wire to the chassis because the head unit is already grounded. Does anybody have any suggestions to what may be wrong?

Thanks

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[(Hayden) 10+ year member]

Forget about the metal holding the HU in. Ground the thing out anyways. Quit being lazy and taking shortcuts

 

[kkkd]

Should i ground it to the battery or to the a clean piece of metal in the dash?

 

[fresh93 10+ year member]

Should i ground it to the battery or to the a clean piece of metal in the dash?

Clean piece of metal lazy.