Audio Technica ATH-A2000Z Sealed Around-Ear Headphones Measurements
Raw frequency response plots show a headphone quite close to the Harman target from about 40Hz all the way up to 2kHz. Remarkable! Unfortunately, above 2kHz, things begin to go awry. The peak at 4kHz is somewhat high, which I felt gave them a sharpish character tonally. The drop after 4kHz is probably a good thing to steer energy away from the piercing 5-8kHz area, but response 5kHz and above is a ragged mess. This clearly makes its appearance in the 300Hz square wave and impulse response.
30Hz square wave is quite swayback evidencing the fall in response phase shift below the primary driver resonance.
Generally speaking, the 300Hz square wave has good shape with a right sized initial transient and horizontal overall wave shape subsequently. The problem is that it's noisy...quite noisy.
The impulse response shows us a significant lack of discrimination between the initial impulse and subsequent noise. This evidences to me my listening experience of very grainy, though not overemphatic, cymbals.
THD+noise plots are quite good but for some rise in distortion at low levels, and an alarming increase in distortion at the top as it reaches the measurement limit.
Impedance plots show a nominally 48 Ohm headphone with a moderate primary driver resonance centered at 90Hz. Also note the resonances at 2kHz and 4kHz paring up with the peaks in frequency response.
Isolation at -20dB is good for sealed headphones of this type.