Acoustimass module lightly hisses but has no sound output at all

Acoustimass module lightly hisses but has no sound output at all

I’ve had a 3-2-1 system for some time but it has been in storage (A closet) for a couple years. When fully connected the media center powers on fine, the acoustimass module only hisses (it does get louder as the volume is turned up on the media center) and nothing whatsoever is output to the speakers themselves.

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