Shin,
Have heard the DEQX in a couple of applications, I believe some of the Apogee boys quite like them (Hence the Oz connection).
Derek (who is a nice chap and I've had dealings with) had a pair x/overs modifed by Graham Folwer back in 05 (Trichord). I did spot the special psu that was made for it in a what looks like a delphini box? on one of the websites last nite
I felt Derek speakers better suited valve amplication and TT's.
Not the sound I personally look for, but good none the less.
(Not a fan of the manger driver arrays you see, yes dynamic and fast, clan and open buy just not 'right' although it has a following especialy with the asr crowd). Though better than the zero box 9's I've owned.
Well a I've yet to hear any digital x/over sound good to my ears, and in one form or another been engauged with them for over 14 years, technology has moved on for sure, but the for us the problem still remains mechanical sound.
I heard (recently) one of the lesser models being honest it sounded none shabby so a good base to which to work from (I would take them over the hypex modules for sure).
It would be nice to hear how you feel you have managed to over come this issue Shin.