whistle noise from subs

[500000watts 10+ year member]

aright i just installed a system in my boat and it never did this when i had it in my car, but when i turn on the head unit and the sub amp kicks on i get this wierd noise in my subs, its pretty loud it sounds like a high pitch hum, more of a whistle though.

what could i check over to see if i can fix the problem?

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[patalpine]

i would check the ground first of all

 

[cxixer 10+ year member]

Definately. If not, then check your signal going into the amp.

 

[500000watts 10+ year member]

i have my ground hooked up to the fuse block, could that be it