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I was debating between the jbl pb12 and the velo ct 100, I decided on the velodyne because I was afraid of having to return a sub, plus I felt the velodyne was a better sub. It pounds hard !!

Take a look at audioreview.com under the jbl pb12 reviews. Some people have had this sub blow on them and make similar sounds to the one you are mentioning. I went with a velodyne because I was scared that might happen to my 575x.