Actually I crossed over (and Eq'd)electronically at 24 dB/oct from 70 Hz to 200 Hz. The higher the crossover the worse the sound and the lower the crossover the more limited the output.I finally concluded that if you listen primarily to Leslie Olsher and/or small group works that tend to benefit from "polite" levels it's a very good design, easily executed unlike most Lowther horns. But if you want a speaker to do "everything" that isn't the path to the holy grail.