whinig noice, bad ground?

I did a search but couldnt fine what i was looking for, I had alpine head unit iinstalled a yr ago and have been liiving with a whining noice that get louder with thr increase of RPMs or pressing a power button such holding down the power window button. I've kinda got use to it but im looking to sell and upgrade mustangs and i want everything to be right when i sell it. I have hear two different reasons why this may be happeneing, a bad ground or i need a filter? ( the last siggestion came from a stereo store, same ones who installed the unit so im not really trusting them.

thanks for any help

no

thanks.
I was able to get it all sorted out the other day.
now all i nee to fix is the abs light problem which i hop is just the sensor/module