Originally Posted by counsil
Sorry, not been on AVS for a long time...
One last thing, don't try to integrate a SubM with an Empire. Although the Empire is sealed, it cancels out the SubM's output below ~20Hz for some reason. Maybe because the Empire's amp's DSP is more characteristic of a ported sub???
I am still running them together, but I probably won't be much longer.
Originally Posted by capecodorthopod
They shouldn't cancel at lower frequencies only since neither is ported and there is no phase shift.
REW should show you what's going on.
Doug is correct here. While in theory this should work fine with different sealed subwoofers, the implementation is everything. A 2nd order high pass filter as is used in the Epik amps creates the same phase shift observed in a ported sub, which means you are likely to have some cancellation around the low corner of the high passed sub.
That said, in some rooms you can occasionally see two such locations (front/rear) interact in this manner, but this is more often when the room is fairly irregular. If one of the SubMersives in the same location as the Empire's doesn't cancel, then you know it's due to the phase differences in the sub behavior.