Haven't thought much in depth about specs and the sound of a speaker but I doubt that can be used as a workable guide. Speakers can measure similarly and sound vastly different.
I don't have the music-speak for it, but to me (after 45 years of listening) it is all about how the speaker 'releases the notes'. Some may sound 'lightweight' and still measure like fat or dull-sounding speakers. And, sadly, not all speaker lines have guaranteed consistent sounding models...but most seem to have their own sound.
I'd say try to hear as much as you can and take notes on general sound quality. Amps can affect this somewhat (might not hurt to note the amp you heard driving the speaker you auditioned). Buying an unheard speaker is a lot larger crapshoot than amplification or source. I only bought unheard, used D2s because I knew exactly what D1s sounded like in my room and knew the only difference was the additional bottom end. That was not a gamble. :-)
I'd suggest reading reviews (and lots and lots) as a better way than specs to arrive at potential speakers to try to listen to. It takes time but when you start to understand different reviewers' biases it gets more informative. Specs can sometimes tell you what to stay away from. Have at it!