Originally Posted by thornygravy View Post
Most quality amps will have differential inputs. It's head-units are that mostly single-ended.

The problem is if you use single-ended rcas on differential inputs (which a lot of amps have, you WILL get noise, but not vise versa)
That's not really true. A single ended source into a diff input will simply put a zero volt ref on one of the diff inputs and signal on the other. The diff input won't care.
Where you run into trouble is a diff source into a single ended input. You are grounding half the signal chain.

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