"Completely cleaned up the mids and highs and improved power handling."
YOu describe exactly what I have heard many a time, esp with the smaller full ranges. At the GPAF this year I demoed exaclty that with the 4" DCA drivers in a PAWO horn: a classic case of a driver being able to do 45HZ in a BLH, but producing COPIOUS IM. Crossing it at 70HZ cleaned it up very significantly.
I would think that applying the high pass in front of the amp, even passively would give even better results than at speaker level. It would allow you to run the amp higher before clipping in the trebles. It could be as simple as reducing the input coupling cap by a factor of 10.
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