Hi Richie,

Does your EP600 amp have a switch with "Flat" and other bass-boost settings (Half, Full) as well settings called "Load" and "Remote?."

If so, check it and make sure the switch is NOT at the Load or "Remote" settings. The subwoofer will not work if the switch is at "Load". Make sure the switch is at Flat and hasn't been accidentally moved to a different setting.

Regards,

Alan Lofft,
Axiom Resident Expert (Retired)