Recently had to disconnect the sub to paint the room, was working fine. When I reestablished the subwoofer connection, the subwoofer emits a strange constant sound, sounds like ummmmmmmmmmm
Subwoofer connection to receiver (sub pre-out)
Y split cable to subwoofer
Low pass set to 180
Phase switch - have tried each position
Am I doing anything wrong? Did something happen to the subwoofer?