Hello. A couple of weeks ago I finished building a sealed CCS SDX 15" sub. The enclousure size is 3.75cf (internal), the amp is ED LT1300 and a ED EQ2 eq.
After running my yamaha YPEO, the sub is caligrated with my radio shack digital meter. The sub is on a space of 4,500-5,000cf room. The sub sounds good on music and at moderate levels, good on movies too. The problem is when the sub hits around 100db or higher on movies such as explosions, it makes a popping sound (driver bottoms out). My sitting position is 9ft from the sub. The receiver LFE setting is at 0 and the output at -10. Crossover is set at 80, small on the speakers and calibrated with the sub at 75db. The volume on the amp is set at 10:00 and the phase is 0. I've run it with and without the ED EQ2 but no luck getting rid of that popping sound. I plugged the receiver and the sub to different outlets (I thought maybe a lack of current from one outlet was a factor), well, no luck. I don't believe the amp is clipping. The enclousure is made out of birch ply, heavily braced (check my forum on "first CCS SDX 15" sub made" here. The space from the back of the driver to the plate amp is about 4". Maybe the sub is not wired correctly? It's a D2oms sub. Thanks for your help.