Thanks for all your input bestbang. I have already tried some of your suggestions. I played a DVD until the LFM-1 POPPED then disconnected it hooked up the JBL and it played fine no POPPING and I have the JBL volume set wide open. Then I hooked back up the LFM-1 and sure enough it POPPED again with no volume changes. I also layed the LFM-1 on it's side and played it and it POPPED, I did not here anything loose inside the sub when I laid it over. I played with the volume on the LFM-1 and it does not POP below 5 but then I loose quite alot of bass. As far as the volume on the Sony Reciever if I stay around 45-50 it does not POP crank it up to 55-60 and the LFM-1 set on 5 it POPS all the time I have my sub volume level on the Sony set at 0. Am I wrong to think I should be able to crank this thing up to where I can feel the bass without all the POPPING???? I am thinking it may be something in the sub surging to much power to it. This thing POPS LOUD I MEAN LOUD!!!! SOUNDS BAD.