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The review is fascinating.... these speakers reproduce a square wave and impulse better than anything I have seen. The fact that is was done all passively is amazing. This all leads back to the question of are first order crossovers "better"? Clearly they measure better than any other crossover configuration if square wave's and impulse response in one spot is what you are measuring. If you are measuring off access or any number of other things including complexity and expense they are poor. Ideally a SOTA speaker would be able to reproduce a square wave/ impulse response/ not ring and have good off access response and frequency response and be practical to build and sell and would work in any room... obviously we are not there yet.
Well the Quad's do squarewaves, have a better, though not necessarily great off axis response and the exact position to get a fair squarewave is not so critical. Notice in the article they talk about how you move vertically just a few inches and the response changes. Notice the very up and down vertical plot. This is an issue with 1st order crossovers. Vandersteens do the squarewave thing and also have the off axis problems.
I'm hardly one to complain as I like panel speakers which have their own issues.
One could build an active time and phase coherent 4th order system that would have reduced lobing off axis, but in truth it seems doing so isn't necessary for good sound.