Hi -- I'm a new Sonos user, but I've been lurking for months trying to anticipate problems, etc.
Finally got Sonos wired into my main system today, sounds great with FLAC off a NAS. However, I'm having significant subwoofer hum when my system is OFF. When the main system is on, no hum, just good music (even when quiet, no hum).
The Sonos is connected via line out to the Video 1 (only option) of a Sony HT mini-system (F100W - very limited space in a tiny cabinet in this room -- big fan of an ampless ZP theory
), which has a mono line out to a powered sub. The auto power off on the sub doesn't seem to recognize that there's nothing coming across, so the hum continues until I disconnect the line. I've tried turning down the volume on the Sonos, muting Sonos, no effect.
I have other ZP's line out to other systems and subs without this phenomenon.
I'm sure there's some wiring issue at play, obviously. Just not sure where to start and wondering if someone else has experienced this, or any suggestions out there?
Tried searching for "hum", but it's too short for the engine on forum. :)
Thanks for the thoughts.