Car Audio & ElectronicsDiscussionCommunity Starter

Question: Alternator whine after adding a DSP amp

V8Owner35Community StarterJul 5, 20262020 Audi Q7 55 TFSIDallas–Fort Worth
System is clean with the engine off, but as soon as it starts I get a high-pitched whine that follows RPM. I already checked the obvious grounds. What is the most efficient order for isolating whether the noise is power, signal, or routing? Trying to diagnose before I book a shop.
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