sorry for that particularly poor writing in #33. i was in a hurry and botched it all up, but i think the key point is that an mtm, within its limitations can have some advantages. as far as getting it matched to the cd/horn, the driver center to center spacing is actually better than in the typical tmm design unless the bottom woofer is 0.5 and that has its own bag of issues. of course, 3 way is possible, but that seems like a waste given that they will be crossed over to subs. sans subs, 3 ways make a ton of sense.
since we've been discussing distortion in the other thread, it is worth noting again that distortion scales roughly 2:1 with increases in spl. so as the spl is increased by 10db, the distortion rises by about 20db, roughly. since adding a second driver is +6db, having two drivers playing vs. one driver playing gives a reduction in distortion of 12db for any given listening level. that's nothing to sneeze at.
as for specific designs, i'm not sure there is much to it other than doubling the cab volume and reworking the crossover.
"We also didn't finish talking about the angled horizontal woofer idea either."
yeah...that is one that i'm very curious about as well. if it works as i suspect that it does, it could open up some more interesting possibilities. we'll see how chops experiment / test box measures...
klipsch had an mtm kind of like we are talking about, but it was a floor stander and without beam steering the forward lobe upward, i'm not sure that i like that idea. ideally the cd/horn is on axis with the listener's ears. but if it helps provoke a design idea...great. perhaps some combination of that and/or some the other things I've drawn up may help....not sure.