I agree with @bdp24 . After looking at waterfall plots for years, I feel like I can get a good idea of a speaker's amplitude response even though of course in the end, you have to listen to it.
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.