| I had this problem when I first got the Z. My rear right and front left speakers would squeal randomly and very loud making it impossible to listen to anything. I searched around and found the Amps are prominent to failing so I replaced them all with a complete set of working amps. If you go the route of replacing them, make sure the amps are matched. i.e dont put amps that originally powered the front speakers in the rear or if they come from coupes or 2+2 Zs, try to stay as close to the original configuration. The stock Z Bose system sounds good when it's working properly, but I am no audiophile. :) GL
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