It is not shown on the HTM website yet, but in the magazine, they measured the typical 5-point average on-axis & +/- 15 degrees horizontal/vertical off-axis of the AbsoluteZero to be +/- 0.90 dB from 200 Hz - 10kHz, and like 80Hz-20khz +/- 3dB.
For the price of $175 each, I don't think I've seen a better on-and-off-axis response from 200Hz - 10kHz, have you?
I mean compared to other $200 speakers? Or even $1,000?