Buzzing/Whine Over Speakers When HU is On

[MrFriskles 10+ year member]

So I have had an install running for like 3 months just fine. I moved about 600 miles north and it was still operating fine. Then after a cold night I started to get this buzzing/humming over the speakers when my head unit is fired up. A quick looked showed everything was fine. Wanted to get some idea on where to look or what to do before I started looking deeper. The whine seems to be related to the engine RPMs. Any ideas on how to isolate this?

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[fish1234 10+ year member]

Did you mess with your gains on you amp/amps at all?

 

[Robert 2001 10+ year member]

Sounds like alt whine id check my grounds/ reground any thing loose then check rca as sheilding could b frayed or smashed.