amp making buzzing/humming sound when first turned on

goodrich
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i have an MTX 5-channel amp that buzzes/hums when it is first turned on then after 5 or 6 minutes later it fades away. this is actually the second amp to do this, the first one started to do it about a week or so after it was installed and the buzzing sound never went away. still got over a year warranty on the amp but since this is the second MTX that's done this it's making me worried about reliability issues. i really like the amp but this *****! i also have a 1501D that i haven't installed yet and i'm worried about that too. any suggestions as to what's making the amps crap out?

 
Sounds like the same thing that my 1501's do when I turn them on. I have never noticed it on street banging amps on 12v's though. My 1501's do it at 18v's, its just the power supply buzzing, not a problem with the amp.

 
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goodrich

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