Luxman L509X owners - Question about Main In
I own a 509X that I bought used back in August '18. I recently picked up an Anthem AVM 60 and I'm running the main pre-outs into the RCA "Main In" (HT bypass) to run left/right on home theater. However I am noticing a faint 60 cycle hum from the mains (very sensitive La Scala IIs). I do not hear any noise at all from the other speakers in the HT system, which are running from a Monolith 7X amp.
If I hit the "Separate" button on the 509X (using the internal pre) the hum is not there - it is ONLY on the Main In when the "Separate" button is engaged. When I plug the same Anthem pre-outs into the Line In input of the Luxman, there is no hum.
My worry is that this is an amp issue with the Main In input/preamp bypass function, as I can't replicate it in any other inputs. Is it possible there is an issue with the Main In/bypass input? I hate to have to send the whole thing off to be looked at, and in theory I could bypass the 509X for HT altogether and just run my mains from the Monolith (will have to add another 2 channel amp for Atmos speakers). But I'd like to know if there's an issue with my Luxman.