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

Impulse response using square waves. Surprisingly many speakers fail badly at this simple test. The Quad 57 and 63 both do well, as does Walsh and Magneplanar. This is a test of coherency - one pulse in should produce one pulse out. Multi-driver speakers have difficulty with this! 

John Atkinson of Stereophile does the best quantitative testing of speakers! Unlike electronics speakers have not evolved to the point where they can hide their flaws from careful measurements!