I owned the M3 & M5 & they both sound quite different. From what i understand, the M4 is not available outside of japanese market. I briefly heard the M2 in 1984-85 & it was very impressive sounding. Very deep bass coupled with smooth midrange & sweet extended sparkling highs. Also heard the M1 but prefer the M2. Never seen or heard the M6. Interesting video.
I owned the M3 & M5 & they both sound quite different. From what i understand, the M4 is not available outside of japanese market. I briefly heard the M2 in 1984-85 & it was very impressive sounding. Very deep bass coupled with smooth midrange & sweet extended sparkling highs. Also heard the M1 but prefer the M2. Never seen or heard the M6. Interesting video.