r-11
Contribution of an audible and beneficial effect by way of shorter path to ground does seem unlikely. Appears to be something (easily?) tried out via DIY. I’m guessing only the ground pin of the AC plug is connected and that to the negative/ground lead of the RCA plug. Can’t imagine applying AC power to a component through an RCA jack and not doing some damage. But then again, I'm no EE.
Contribution of an audible and beneficial effect by way of shorter path to ground does seem unlikely. Appears to be something (easily?) tried out via DIY. I’m guessing only the ground pin of the AC plug is connected and that to the negative/ground lead of the RCA plug. Can’t imagine applying AC power to a component through an RCA jack and not doing some damage. But then again, I'm no EE.