Question about JBL SCS145.5 System

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JBL SCS 145.5 Subwoofer

Last night while everyone was asleep, i heard a very loud low frequency sounds. It sounded like bombs were dropping on the house. After running into the living room, I finally realized it was the sub. I looked at the receiver and it was on the red light, I reached behind the receiver and pulled out the sub cable and it didn't stop, so I just unplugged the powerstrip its plugged into and it stropped.
this morning I plugged it back in and it started up with the same noise. And then jumping from red light to green and then green to red.

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