I also agree with @bdp24. A waterfall plot provides the most revealing graphical representation of a speakers frequency response. However, unless procedures are standardized, comparisons between manufacturers/models will have latent errors. Also, on and off quasi-anechoic measurements do not represent real world response. While critical during the manufacturer’s design phase, quasi-anechoic response graphs are useful for to attempt to make some preliminary determinations if a speaker may meet our listening preferences. Audition in a real world environment, and if possible your own home and system is necessary.
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.