You also wrote :

"For these reasons, if I am going to put my Lowther DX4s into a box, it will be a back horn, not a reflex box, which Lowther owners say suck, nor transmission lines, which are a step above reflex boxes, but still not as good a match."

I own seven pairs of Lowther drivers, including a pair of DX4's, and find they perform very well in TL and ML TL style enclosures. So this Lowther owner definitely does not feel that this design option "sucks". It is one compromise that can be considered for Lowther drivers. I also use 200 watts of SS power and can report that does not "suck" either.

Martin

• Quarter Wavelength Loudspeaker Design