StangBat, I'm not ignoring your advise; it is well heard, duly noted, and much appreciated.
Though I can afford it under any circumstances, I've been looking at Dayton WWMTM designs but not with an 0.5 section. I want both woofers operating together full time. Also, I was considering maybe 8" woofer, but more likely 10" woofers. But keep in mind, this is all dreaming, and it is easy to dream big.
Also, this isn't a custom designed exclusive cabinet. It is a cabinet that Zaph has used for several designs, and he just moves the internal chamber partitions up or down to created the appropriate internal volume. As such, I don't think I'm that far off in readjusting the dimensions to accommodate front ports as long as I leave the internal chamber volumes the same.
As to the JBL's, I've got a fairly small listening room, though it does connect to an open kitchen which in turn connects to an open dining room, so the speakers are unloading into a fairly large space even though the listening room itself is pretty small.
My speakers are about 10" from the back wall and that is about the best place for them and is consistent with my previous DIY speaker which are front ported. At that distance with the bungs out, the bass and midrange were horribly indistinct, muddy, and muffled. Voice is important to me as I listen to a lot of TV through these speakers. Plugging the ports with 2" open cell upholstery foam cleared it right up. Most distinctly cleared it up.
Now, I only paid $200/pair for the JBL Stadiums, and for $200 they sound OK (Best Buy floor demos). For $200 I can't complaint, though I will. But I didn't buy them expecting $200/pr speakers; I bought them expecting +$600/pr speaker and in that light was sorely disappointed.
Now I complained (actually whined) about this in other forums, and people said that I needed to get used to them; that I needed to listen long enough to get my old DIY system out of my head. My old DIY system has a 12" CTS woofer, a 4x10 mid horn, and a 3x3 horn tweeter. Admittedly some people find horns tinny and harsh, but I find them very clear, present, and crisp though they have to be turned way down to create a balanced sound.
Keep in mind the crossovers on the JBL are at 300hz and 4000hz, that puts a lot of demand on that little 4" cone midrange.
I bought the JBL's on June 6 and have listened to both music and TV through them every day since then, and they are growing on me, but in Mid and High, they will never equal my old speakers. Right now to get my old DIY speaker as closely balance to the JBL's as possible, I have the midrange turn down to the 'I' in 'MIN.' on the L-Pad dial, and still my speakers have clear, crisp, and extremely present midrange compared to the JBL's. Voices on the JBLs are clear enough, but they sound flat to my ears.
So, time to correct some long overdue problems with my old DIY speakers which originally cost me less than $250/pr plus labor. The speakers are made from cabinet grade high density particle board birch veneered wood (50 pounds each). My current mods are going to cost me about $70 and a little labor. If these JBLs are $600 speakers then my DIY speakers are $1,000 speakers, or at least the will be when I'm done.
Now, the JBLs have decent bass, certainly deeper than my old speakers, and the mids are clear and distinct, just a little flat. So overall I would probably think they were a decent speaker IF I didn't have my speakers for a side-by-side comparison.
So, I'll use the JBLs until my old speakers are rebuilt, and then sell them...or maybe not. I played an action video with all four speakers playing and it was devastating. (Keep in mind this is pure stereo, not surround sound) The sound was so intense, my anxiety level shot through the roof. I was literally trembling with excitement.
So, as not to highjack this thread. The Zaph speaker are appealing, but I just can't see the rear ports working properly in a cramped space. Consequently, if I every had the resources to build these speakers, I would make adjustments that would allow me to front port them. Hey, that's just the kind of guy I am.
Love the Zaph speakers, and the workmanship on the current examples is very impressive. How can you look at those speaker and NOT want them?