Essentially poor. As I've been educated lately to look out for resonances in the sub dB range, that one at 590Hz breaks it. Even when taking my previous stance the resonance is a quite hefty fault, regardless where it originates in. The raise in 2nd order harmonics may point at a problem with the suspension, though. Hence the overall picture would suggest to better expect elevated intermodulation distortion also which would rebel against the usual phase distortion of a common 2-way.
I wonder how that objectively low performance could lead to, undisputed, listening pleasure? Simplest explanation: reference missing? As is the case for 99,9999999% of all loudspeaker usage. The fun is there, because the music is there, but slight deviations from ideal--who actually cares?