Hisrudeness said:880 is top of the range and a heavier, better built and louder box but lacks a little treble and you tend to be constantly adjusting bass, treble, DSL when you play different types of music.
In essence there's less messing around with a healthy 770 but 880 is the class.
as found out recently, a truely beautiful looking,and sounding radio.i totally agree with your feelings on the m70 versus it too.aiwa=better 

These are very nice pieces, i love both CS-660 and 600 but 600 looks more awesome to me with it´s LED level meter 