if Axiom states that the M80’s frequency response is 34 Hz - 22 kHz +/-3 dB, this indicates that every tone that emerges from the M80 will be within 3 dB of any other over that entire frequency range.
Well, that is either misquoted, or untrue, or both. The tolerance is +/-3db, not +/-1.5db. To be +/-3b is a 6db swing. Axiom's graph shows the evidence.