try taking the sub out of the system and playing some music at low-medium levels and see if the problem continues. if yes, then you know the issue is not with the sub. if no, then you know something about the sub (position, integration into the system)

now, I would use the speaker level connection to the sub as my last option- you may have overlapping bass, cancellation of bass, etc. with proper setup this can be avoided, but it is tricky. I would give all available methods a try though and see what works best. I found the best method when I used analog speakers was to tell the system I had no sub, and run the line level (balanced) to the sub, let the sub split the signal and then the split signal (high pass) went back to the speakers' amp and the low pass stayed with the sub.

have you calibrated your system using the test tones and a spl meter? if no- this should be done asap.


Best regards,
Jerry
Main System: 861v6, DSP8000s in corners, DSP7000s Center and Sides, 1-9 humans.