I have never been able to discern the voicing of a speaker from performance specs.
Heck, even the humidity levels in my room change the sound. Let alone all the other variables.
I have concluded that performance specs are for bench racing.
Should Speaker Manufactures provide a Frequency Response Graph?
Eric at Tekton Designs has been battling two different reviewers who have posted measurements without his permission, using Klippel devices for their respective measurements.
It seems to me that if manufactures provide a simple smoothed out graph, consumers can see how much a speaker is editorializing with a frequency response that deviates from neutral.