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Actually, reading Toole's book you would find that consistent sound quality delivery under various acoustic conditions was one of the motivations for the NRC and subsequent Harman research on loudspeakers; as it was considered impractical for many consumers to turn residential spaces into acoustically treated listening rooms.And to the WAF, odd-shaped room, bad acoustics, and so on. What do the good measurement speakers do about those things?
(I mean, why do you bring up things like that?)
Conclusion of this research is that flat on-axis and uniform off-axis response in a loudspeaker resulted in increased preference under diverse listening conditions (compared to loudspeakers that don't exhibit such behavior) - which is why it is considered that a good spinorama translates to a 'good loudspeaker' (at least to most listeners, under equivalent, level-matched, and double-blind conditions). I.e. a 'good spin' makes a loudspeaker more likely to sound good to various people listening in various acoustical environments compared to a loudspeaker with a 'bad spin'.
That of course does not in any case mean that all loudspeakers with a 'good spin' sound the same, nor that any such loudspeaker satisfies every individual requirement.
Trivial examples of this are different SPL and LF extension capabilities of different loudspeakers (with otherwise 'good spins').