Car Audio & ElectronicsDIYCommunity Starter

2013 Nissan 370Z — alternator whine after adding amplifier and DSP

CamberScout887Community StarterSep 2, 20262013 Nissan 370Z TouringDenver
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? I am in Denver. What would you check next?
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