What tests would you like all speaker reviewers to do for their reviews?

Test the limit of the power handling, and crossover parts, wiring.
push em to the limit, as MANY OF US DO!

  Maybe after multiple failures, will,they put better parts in the crossover to handle the power of being pushed to the speakers RMS and peak recommendations of the mfr. 

The only meaningful test of a speaker is how it sounds (in my room with my equipment and listening to my music). Nothing else matters.

There’s a reason reviewers don’t do any of this. They review them in their homes so the sound is room dependent to begin. Second each of us has our own subjective sense of what sounds best. 

thorough battery of stereo imaging tests to check stability of stereo image at various angles outside of the classic equilateral triangle. aside from the maggie tympani III, the only other speaker i've heard which offers stable stereo imaging no matter where in the room you sit or stand, is the bose cinemate sr-1. also there should be tests of volume versus odd order harmonic distortion to ferret out speakers whose sound hardens at higher volumes. also bass extension versus power handling. some speakers can reproduce the 32' pipes at low volumes but turn up the dial just a bit and you get doubling or worse. 

Reviewer invites 5 of his audiophile friends over. They are blindfolded and listen to the the speaker being reviewed, mixed in with 4 other speakers rotated and sound matched and they list what they like and dislike about each.
Removing as much bias as possible gives the best result.
Comparing blind tests to other speakers would tell me alot about my likelihood of enjoying that speaker.