This would be an extremely easy test for craigsub. Just set up one each M50/100/prime tower and leave the others for a week or so. Run the speakers 24/7 in the basement away from yourself. Then listen to the out of box vs ran in after. Would be excited and validated to hear his results!
. He's buying them anyway. For science! Lol. They wouldn't necessarily need to be set in the same spot either. Differences should be noticed readily enough without that level of precision in my (narrow) experience.
Suggested tracks:
Man in mirror- Michael Jackson
Shes out of my life - Michael Jackson
Everything in its right place - Radiohead
Anything with sustained tones in the mid/treble range as my dealer showed me could highlight these differences. But once noticed, any material sounds unacceptable by comparison.