In reply to:

I have a distinct feeling that it would be far too easy to distinguish btw. the M22+EP500 and either the M60 or M80 sans sub -- unless you restricted your test material to recordings that didn't dip below the rated ranges of the towers.



Good point. That would have to be the limiting factor. That being said, most music does not fall below 27.5 Hz (low A) and rarely dips below 30Hz (low B). Specific music would have to be chose to meet that criteria but it would be an intersting test.