My electrician is a Audiophile ,I followed his lead.
i hav3 Copper gold outlets ,
awg 10 copper wiring in a 30 amp breaker , and the 4 wire
dual ground 1 is common the other a insulated is located ground on its own strip in the breaker box ,then grounded to a 4 ft Copper Rod and the Breaker is a Siemens from Germany solid Silver which was $60 , the stock copper breakers are $12.
night and night better sound ,very black back ground.