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My old yamaha subwoofer started to produce a loud growling sound. it made the speaker cone move in and with great force. this made it unusable for 4 months now. the problem started one day when I was normally using it listening to music at normal volumes. At first I thought the volume control is busted. I opened it, but found the volumen controls is not at fault. I checked its resistance with a multimeter. then I tried to check both the low level input RCA terminal and the speaker level input terminal to connect from a signal source. same results - loud growling. Now I don't know what caused it. Any help or explanation from the experts I greatly appreciate. Thanks a bunch!