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This driver is good from 500hz to 18khz which starts to roll off at about 12khz. I have since made an upgraded version of this horn which is 2 inches longer and wider at the mouth and has a much better response above 12khz. You can see those measurements down on the next page.

Testing on axis to 90° off axis in 10° increments looks pretty good to me. The music from these horns just blooms outwards creating a wide enveloping soundstage with consistent presence even as you move around the room. These speakers disappear into the room with airy musical delight, with natural weight and ease.

The distortion graph looks pretty darn impressive as well. 1khz at 104db has a 3rd harmonic distortion of 0.081%. Listening fatigue? what’s that.

The waterfall is impressive showing no sign of resonance 40 db down.