He mentioned "neutral" and "accurate", if I remember correctly. I am not sure we all know what qualify a speaker to be considered neutral and accurate, I mean even just on paper such as graphs and specs. Obviously a speaker that has +/-6 dB over the audible range should not be consider accurate, but should a speaker that has +/-3 dB necessarily considered not as accurate/neutral as one that offers +/- 2 dB, without considering other factors such as the what, where, how and things other than frequency response that also contribute to sound quality, such as distortions, transient response, ability to do well with more complex signals such those recorded in huge symphony orchestras?
I think there aren't much unkowns in amp specs such that provided the specs are honest, detailed, complete, and verifiable, I feel comfortable to make a purchase decision without relying on my ears. With speakers, I am not willing to judge them by looking at the specs and graphs only. Don't get me wrong I do value specs and graphs, but to a much lesser extent that I do with amps, that's all. And I do use them to weed out speakers that I won't even bother considering.