Thanks for the mini tutorials! Can't have too much pertinent info to cross reference, elaborate on other's [somewhat] abbreviated explanations, etc., so my kind of 'pollution'. 😉
No problem. I always like to learn some new things.
I have good carpets and almost* 4m tall ceilings and I sit quite close to my front speakers, so I don't think the only benefit of less reflections will be enough for me to do an MTM design.
So the options are to go with the same drivers in a 2.5-way design, get a pair of faital midranges (https://en.toutlehautparleur.com/media/catalog/product/datasheet/faital/3FE25-8.pdf) to make a T M W W alignment, or buy more expensive tweeters and do an MTM alignment.
I am open to a waveguide for the small tweeters. Then I could possibly cross them higher and they'd play lower. The question is, how would I do that in practice? They already have small waveguides built in, so it would be very hard to integrate something without diffraction on top of that?
For bass, I'm leaning towards ported. I heard that t-lines have more trancient bass and slope down more gradually than ports? If you happen to know of very cheap passive radiators that fit this in Europe, tell me.
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Why?
They are cheap, yes, but IMO have a very low moving mass and seem to play linearly up to 10khz without cone brake up. They also have phase-plugs for directivity, that is not usually a woofer trait.
I looked at them more like the high end Tangband fullrange speakers that many use as point source speakers. They also play the full range and have an Fs of 40Hz, which is impressive. Isn't a lower Fs better because it won't cause as much distortion?