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.
