Received this evening and tested by enjoying a song of mine that lasts 2 minutes and 10 seconds and features a complex arrangement of 16 tracks, including tubas, french horns, two sets of timpani, a 40-inch Ludwig drum, double basses, three sopranos, tubular bells, shakers, harps, pipe organ and a deep bass synthesizer. The frequency range spans from D-1 to E5 (A4 at 440 Hz, Equal Temperament), that is 9.18 Hz to 659.26 Hz plus harmonics.
Initially, when compared to the Zero 2, I preferred the Zero 2 after the first listen.
However, after readjusting the fitting, the second time I played the song, I found them indistinguishable.
For the third attempt, I decided it would be best to try again tomorrow...
Voted great.