Well thanks for the positive comments on my speakers (the Stormbringers). To clarify one thing, the port system is modular - each port consists of an outer flared section, a short straight section, and an inner flared section. Possible configurations include outer flare only, outer flare + straight section, outer flare + inner flare, and outer flare + straight section + inner flare. Each of these will result in a different tuning frequency. My supplier is Precision Ports, www.psp-inc.com. To change the port length, the port must be removed (it's held in place by four screws). I use electrical tape to hold the sections together. So changing the tuning takes a few minutes, and the tuning is not continuously variable.
I'm flattered that my speaker is mentioned in a thread on the Fremonts. Let me just comment that the design of the Fremont is very innovative and advanced. Evidently its bass loading technique has some significant avantages over traditional isobarik boxes as far as efficiency and/or impedance goes, yet it retains excellent bass extension. The Fremont goes a lot deeper than my Stormbringer does. Now the tangent I tend to go off on is radiation pattern, and the Fremont is much better in this respect than you'd think at first glance. You see, in the upper end of its range the woofer's output is primarily radiated by the dome dusctap. So the woofer's radiation pattern characteristics transition from that of a 12" woofer to a 3" dome midrange! This is ingenious, and I tip my hat to Tierry for his innovative approach. The result will be much less radiation pattern discrepancy in the woofer-to-tweeter transition than most speakers have (not even taking into account the felt-treated recess for the tweeter, which will probably help some more).
I've only heard the Fremonts once, and liked them very much. Realistically their competition is other high quality fifteen to twenty grand ballpark loudspeakers, not my 2.8 grand speaker.