I recently purchased an EP175. For whatever reason I can't get the Active Auto On/Off feature to automatically shut the amp off after a period of time with no signal from the amp. I'm using the high level imputs, and wonder if the auto on/off feature will not work when using these. Even with the amp off for several hours, there is still a quiet humm from the amp and it is not shutting off.

Any help understanding what is wrong would be appreciated.

Thanks,

Kaz