Stereo loud noise when starting car

[OBR1EN]

Hi guys i just finished installing a second amp into my car and a pair of 6x9's. Its an 800wrms Monoblock amp and the 6x9's are 180w Pioneers or something. I already had a Kenwood 350w amp running a Kenwood 12inch sub. So this is how i wired it.. i have two power cables coming from the battery one for each amp and two ground cables (one of top of the other) The remote/accessorys wire i have coming from the front and spliet at the boot with one wire goin to each amp and as for the RCA's i have used splitters to get it to each amp. The Kenwood 350 now runs the 6x9's and the 800wrms runs the Sub. I had it goin and it work fine it was loud as and as soon as i started the car the sub vibrated at full noise even with head unit off, only way to stop was pullin RCA's out of the sub amp. Any help? Cheers

[holdenboy]

Faulty amp?

What brand/model number is it?

It sounds like youve done everything right, did you run the power cables and RCA down oppposite sides?

Where have you earthed the amps, and did you scrape/sand the area back to bare metal?

[OBR1EN]

Yer i might take amp back and see what they say mate.. cause the amp running the speakers has no issues. I heard it could be because i am using my factory head unit and high to low convertors

[holdenboy]

That shoudnt cause the problem, providing its been wired properly ofcourse

Take the amp back, if they test it then you'll know its either your install or the amp at fault.