Hmmm. It doesn't seem as if the system you heard was set up well enough to draw any conclusions about the speakers themselves. Any chance you could get the owner to calibrate the system (or help them calibrate it ) and try again ?

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8