@oldschoolsound, Zilch was the backbone of that long thread and his passing a big loss. My current speakers are some cheap OB jobs but when finished house repairs I will try Tannoy MG15 OB with helper woofer/s below.
The last speaker I built with a waveguide used the 18 Sound alloy unit with, I think, an Eminence 10" below which were sold to a mate and later rebuilt as floorstanders. Every time he upgraded amps or cables the speakers came to the party and revealed the superior components. With some encouragement from me he installed some room treatment and these things now sing along beautifully. When we switched temporarily back to some Missions he had they sounded ... well they were very quickly removed.
The econowave or similar style using either the cheap but excellent JBL $9.99 waveguide or the more recently developed SEOS waveguide come in at about 97dB sensitivity, so with low power amps can fill the room easily and because these components are from the pro-sound sector 😲 can blow you out the room with 500W amps.
Another unmentioned advantage is the unusually wide sweet spot created when these waveguide speakers are severely toed in, because of the proximity effect.
