Cranked up the bike and had a high pitched squeal coming from rear channel mostly, but have a slight one on forward channel before the music starts.
Very high pitched, sounds like fingernails on a chalkboard.
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At first I thought , its his taste in music .
Might want to double check your grounds.
2010 FLTRX , Stage 1, 13" Madstad, Mono tubes, SuperShox, Heritage style bars. Alpine CDE-HD149BT,Soundstream Picasso Nano Series PN4.520 , 5X7 and 6.5 Infinity Kappa speakers
If I have to explain ,you wouldn't under stand anyway.