i have a car audio amplifer (to be used in a car now, not home) i looked at the RCA inputs. it's a block of 4 connectors (2 are line in, 2 are line out). the line in has 3 connectrors that go into the PCB. i assume that means a shared ground referance and then 2 signal wires. i am designing a signal processor for the car project. assuming this is correct about the grounds being connected, are there any major things i should avoid in the signal processor, or ways of reducing noise?
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