Axiom Home Page Forums General Discussion Home Theater More amp woes

Those Hosa adapters don't even attempt to create a balanced connection. "Pin #2 Hot. Pins #1 & #3 tied together," that just ties the pin that should be carrying the inverted signal to ground (which is a shared chassis/signal ground on RCA cables).

That results in a half amplitude signal entering the gain stage of the amp. Don't know why it would reduce hum. Unless the circuit integrating the differential signal is the issue. It would require you to run the input volume at a higher level to get the same output.

Using Axiom's supplied adapter actually triggers a switch inside the jack and puts the amp's input in single-ended mode.