Found it !!

>>Well folks, for those of you that are interested (in one man's opinion), in a comparison "review", I currently have a pair of M50s and M60s sitting side by side in my living room HT/stereo setup. I promised to write my impressions of them and I am still comparing the two - but not for long - as one pair HAS to go back. (sorry Ian)

http://www.axiomaudio.com/boards/showflat.php?Cat=&Board=Advice&Number=2774&page=&view=&sb=&o=&vc=1

Hope this helps. If you don't want to read all this stuff, just go with the M60s and you'll be very happy

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