I can’t disagree with that statement more adason…….it’s not a dispersion thing, it’s a summing of the drivers and this is where all the critical detail is either preserved or mashed together.……I may have a better window to the experience as I’m mostly listening critical in the nearfield and I gotta say, for all its shortcomings, the concentric/coax driver sums as close to perfect as I’ve ever experienced.
Yeah….I think AMT tweeter tech is going to eclipse domes very soon…….they just sound so much more composed.
Why not just buy two pairs of this Swan[HiVi] HF 802 kit speaker with dome mids and stack one on top of the other [top one inverted].
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Now they just need to build at least ONE AMT with good vertical off axis behaviour and I'm back in the AMT boat ...
Check John Dunlavy designs, also his early Duntech designs. You might find all your answers there.
Yep…..for home theater and those who like to stand up and sit for listening, the limited vertical window of the AMT is a problem. My Aurum Cantus 2560 will give me a vertical window of about 12” at a listening distance of 10ft, but that’s about it. That was A LOT of $$$ to spend for a small window.……BUT I can say with confidence that when you’re in the spot, the AC AMT is the best tweeter I’ve ever heard.
Going back to the first post
The late Speaker Dave tried it in the Snell XA (two small mids MTM in an expanding array). The challenge is finding capable mids and then mounting them without compromising the tweeter.
Sterophile review of SnellXA
The late Speaker Dave tried it in the Snell XA (two small mids MTM in an expanding array). The challenge is finding capable mids and then mounting them without compromising the tweeter.
Sterophile review of SnellXA
All i am saying is that we evolved over hundreds of thousands years as hominids from our ancestors on the savanna plains of africa. We did not have much defense against predators except our hearing and seing. Horizontally positioned ears and eyes allow us to pinpoint where the sound is comming from. Either to run from predator or to hunt for pray. Up or down hearing was never that important.
Therefore horizontal behaviour of speaker is extremely important for all the stereo cues.
Flat on oxis and well behaving off axis, that is constant or uniform directivity index for higher frequencies.
Vertical is less important since our ears (and eyes) are horizontally positioned. If it would be important, we would have developed ears vertically.
Could be...
But all those verically alligned Dunlavy wmtmw speakers had great following. Every d'appolito mtm has vertical issues, yet they are widely used.
But all those verically alligned Dunlavy wmtmw speakers had great following. Every d'appolito mtm has vertical issues, yet they are widely used.
https://www.acousticfields.com/tom-hidley-non-environment-rooms/
Not my room. I went with a sloped ceiling. And i amlucky to hve a fairly large space.
YouTube videos trying to communicate what part of a hifi sounds like are not very useful or very good.
dave
I don’t know. My ceiling (7-17’ over 24’) more or less disappears anfd it makes a huge difference.
dave
As long as its not coaxial, it will have vertical issue. Even bookshelf with midbass and tweeter will have vertical issue.
With the XO at 250 Hz, the 3 drivers are withing a quarter wavelength and the drivers are essentially coincident. They don’tmsuffer from the need for a tweeter delay as in (most) coaxes.
Entire vertical will be from the midTweeter. Woofers are out of the picture by the time the box radiation ceases being omnidirectional.
dave
Entire vertical will be from the midTweeter. Woofers are out of the picture by the time the box radiation ceases being omnidirectional.
dave
Because you do not use infinite slope crossovers, there is significant overlap below and above crossover, where vertical lobing happens.