Integration DEQX & 400

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I am very interested in trying the digital tape loop idea with a DEQX to do room correction for my pair of JL Audio F110’s. Curious if there was ever any  word back from Devialet on this idea?  While I am mostly interested in correcting 85Hz and below (leaving SAM in place and higher frequencies pristine for Raidho C1.1’s) is DEQX running full range a better approach I wonder?  Also, is DEQX overkill for subwoofers only and would DSpeaker AntiMode Dual Core 2.0 (or other solutions) do just as well for a lot less money?

Hmm -- not sure what you had in mind by "digital tape loop".  If it was to take the digital pre-out, feed it through the DEQX and then feed the output of the DEQX to one of the Devialet's digital inputs, I suspect it's not possible (or won't work as intended).  There was a similar discussion on this forum a little while back, although relating to an analog loop, and Devialet confirmed it was not possible.

If you just want it to correct for the sub-woofer, that's not a problem as you'd presumably just put the DEQX in line between the Devialet's pre-out and the sub-woofer.

Also, is DEQX overkill for subwoofers only and would DSpeaker AntiMode Dual Core 2.0 (or other solutions) do just as well for a lot less money?

I don't know about DEQX but the AntiMode Dual Core 2.0 can do full-range correction, I believe.  DSPeaker have less expensive models (like the 8033) that work for sub-woofers only.  Having said that, I have a Dual Core 2.0 and use it just for sub-woofer correction, as above; it works very well indeed.  I chose it over the 8033 mainly because I liked the ability to configure a number of correction profiles to suit different listening positions, and to select the profile via remote control.  Yes, I am that lazy  For the asking price I think it's a very nice box of tricks.