I just finished building a full range speaker set using JX92's in MLTL cabinets.  I agree with Steve's comments about the benefits of the full range driver approach in terms of image and coherence. It's a very noticable improvement over my existing speakers even though the MLTL design retains the disadvantages that come with high cabinet pressure levels.

One of the things that amazes me about the ZOB design is how effectively the driver couples to the resonate cavity from one side.  But I certainly do believe the reported results.

A question popped into my head reading the four articles on the ZOB development .  What if the driver was turned to point vertically upwards, similar to a radial design and the gap that acoustically couples to the cavity beneath could be a continuously circular gap to a cylindrical cavity beneath it.  Some kind of inverted cone above the cone of the driver cone would have to redirect the sound horizontally.  But if this could be done I wonder if 1) more energy could couple to the cavity to achieve perhaps lower the 3dB cut off, and 2) could some imaging benefits of radial design furthe enhance the imaging?

In practice a six or eight sided cavity could approximate a cylindrical cavity.

So much for absurd ZOB notions.  I welcome any and all reactions.

Chris

Try it!

I'm more interested in your having an enlarger in the center of your listening setup (LOL).

Ah, The joys of living in a one bedroom apt and having photo and stereo gear.... That was an old picture, taken prior to any Decware acquisitions or builds.  Gear in that photo:  Thorens TD160, HK Cassette Deck, Golden Tube Audio SEP-SE pre w/ battery phono, Technics MASH CD,  Hafler DH-200, some Yamaha tuner...and a 1950's Omega D-2 enlarger for room treatment.  At the time, I was planning to mod the Hafler ala Musical Concepts or Van Alstine and buy some Maggies.  Then I heard some Cain and Cain Abbeys....leading to experiments w/ 3" Fostex full range speakers...and my first beloved SE-84C.

I had a hard time tuning those horns and finding the correct internal damping that would cut mid-range transmission through the horn - honking - without killing the bass.  What those horns did well was sound very open and 'live' w/ piano and cello and other resonant type instruments. There was more bass than you'd expect a 3" driver to produce, and I always thought that driver would work well open baffle w/ a bass horn.  I also tried small fostex/s in vented enclosures, but found that they sounded as if some of the soundstage was lost.   The HDT mk I's had a similar presence as the horns, but a much fuller and controlled sound.  I converted my HDT's to the mk II driver configuration and found it to be a very relaxed and balanced speaker.  I missed the fostex experience and had Steve modify my drivers 9 mos ago, and I intend to try the alternate tuning HDT any weekend soon...