Car Audio & ElectronicsDiscussionCommunity Starter

2006 Mazda RX-8 — alternator whine after adding amplifier and DSP

OldSchoolShopperCommunity StarterMay 24, 20262006 Mazda RX-8 SportBay Area
2006 Mazda RX-8 Sport, about 149,500 miles. System is quiet with the engine off, but a high-pitched whine follows RPM once running. Grounds look okay. What is the fastest isolation order for power, signal cables, processor and amplifier? Interested in real owner experience more than guesses. I am trying not to assume the first explanation I see online.
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