1. Can I bond the signal ground at the rca input, Potentiometer, and amp input? See pic. The wire I'm using has four insulated conductors one bare conductor and foil shielding. question 2 if I'm able to use this wire as a single run to the potentiometer what's the best way to Shield it?
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Iddeally use one cable from input connectors to the pot, another from pot to the load. Otherwise you'll capacitively couple input and output and risk high-frequency bleed-through when the volume is set low. If the run is very short as in the picture this might be unnecessary precaution though. There ought to be RF suppression caps on the input connectors to stop RF entering the system.
Thank you I was toying with the idea of using Cat6 wire with twisted pair and keep everything segregated I can use two runs of wire it's only going 5 or 6 in but I was trying to keep it cleaner looking with a single wire run do you think the 24 gauge twisted pair would be okay?
A signal and it’s return need to be individually paired (or twisted, as it accomplishes the same thing). Even if it is a circuit at a megohm impedance. One pair from board to pot for one channel, another from RCA jack to pot. Then another 2 pairs for the other channel. Then keep the pairs close to one another (Don’t make a big loop).