This is exactly what Meridian's DSP firmware is supposed to handle. It sounds like you guys reproduced the problem/frequency on both mk1 and mk2 of DSW subwoofer. Any chance you can make an official support request for fix via dealer/Meridian? That way more can reference the problem and Meridian can fix it in time for DSW XE.  There is a sine output available from the front panel of the Meridian processors. Can you run it and report back @frequency of the pop/bottoming?
DSP8000SE, DSP7200SEHC, DSP5200SE sides, DSP7200SE rears, 861v8, 210, Sim2 Ultranero 4, Stewart Cinecurve 2.35:1, XEIT CM-5E Anamorphic lens, Dune HD Duo Cinema 8K and Wireworld Platinum 48G HDMI -> UHD722 -> Shunyata Omega Ethernet. Shunyata/Furutech power-cables/filters. SR Master Fuse@861v8. Uptone Etherregen with 10MHz OCXO clock.
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