At this point would suggest simplifying. Eliminate variables. So to speak, the more complicated the plumbing the more likely a problem will surface. I know DIRAC is popular and DSP is widely used. Personally, never could get Audyssey to properly adjust a Home Theater sound system. Already mentioned DSP as an issue. A modest application of DSP turned out the best. More is better and too much just right does not work.
Strip the signal path down to the most direct possible. Try feeding one sub amp, default settings or minimal signal modification configuration. Start with all volume settings minimum and no source material. Check for movement of the drivers. Increase the volume in steps, each time check for cone movement. If you note cone movement increase with increased volume, probably have an EMI or RFI noise issue.
If there is no cone movement as you increase volume, start over with musical content. Increase volume and check for clipping. If clipping present likely a faulty amp, or problem with the input signal, or noise being picked up along the signal chain. If all good repeat with the other amp. If all good there, connect both amps and repeat. If both amps do not clip add one item back in the signal chain. Test again. The idea is to isolate, hopefully, a single item causing the problem.