Sloped baffle

You are right Unsound, Audiomachina's website seems to be up-to-date (I saw one post dated June 9, 2014) so it seems that they are alive & well producing time-coherent speakers. Thanx for the correction.

And, BTW, you guys have to read these "Pearls" (of speaker deisgn) from the owner/designer of Audiomachina speakers - esp. for determined naysayers. These notes echo practically 100% what Roy Johnson has been trying to educate us with since 2002 when that time-coherence thread started by RBischoff appeared on Audiogon. Just like Roy's texts, this essay on speaker design is very well written (& I can see time & again the points that Roy has tried to drive home into us re. 1st order x-overs & time-coherence) - a superb & easy read:
http://audiomachina.com/pearls/

Duh, I forgot to add Duntech to the list.

Unsound, not sure I understand your question. You ask why the DEQX "system approach includes analog conversion rather than keeping the whole stream in the digital domain?" Perhaps ... it is because the device is inserted in between the source components and the power amp. Seems that at some point the device has to go digital to analogue in order to drive the amp.

Am I misunderstanding your question?

I hope to hear back from DEQX this week. I've got to nail this time coherence issue one way or the other.

Btw, I been shopping around for insulated 10 gauge solid core copper wire. I intend to make my own speaker cables. May cost me $15 bucks ... gasp!

^Please forgive me, I was confusing DEQX with Holm Acoustics.

Looked up quadrature and unless you're masochisticly inclined to imaginary vectors, this might be easier...

http://sound.westhost.com/ptd.htm