I agree Bob.
One other issue with using the single / wide range driver to produce the bass is IM distortion. For example, the trusonics easily produce 40 Hz in a BR box, but if I cross them higher, te reduction in IM distortion is clearly audible. Very audible in fact. Same with the dca drivers I have in a PAWO horn..these go down to 40 hz..amazing for a 4 inch driver...but the IM distortion is pretty high. Afain, crossing them at 70 Hz 24 db/octave makes hem much clearer. With the 24 db / oct xover I use, 90-3500 hz crossover seems to be the magic number, at least for the trusonics. With 12 db xovers, I agree, the driver should be bale to go upto 6000 Hz with no issues.
I think each driver is a little different, which is one of the reasons there is so much value added by builders like you & Wayne, who pretty much take the trial & error out of it for most folks trying a driver for the first time.
-akhilesh
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