Subwoofer PSW505 110V not working

My subwoofer has stopped working. There is a pop/cracking noise coming through even when there are no inputs or connections except the power. I have tried different input methods and no change. When an input is connected there is no sound except the pop/cracking. The pop/cracking noise is steady in rhythm with a clocks second hand.

All other speakers/misc connected to the receiver are working properly with no issues.

Help?! Any ideas?

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