Regardless of our individual opinion on how much we like the Bose system, the facts are simple. It is not meant to be a thumper system, and it is definitely better than the normal equipment (quality of head unit, amount of speakers, nominal watt handling rate, distortion at average listening volumes, etc).
Sounds like OP has some not ordinary problems. Lets agree to disagree. Oh, and OP, have you taken your Z to the dealership? I am sure they can check it out if you are not fully sure how to check your grounds and what not.
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