Hi AndrewS,

By virtue of a taller and deeper enclosure, the M80s have somewhat greater deep bass extension and bass output. You can hear the difference when you switch from the M60s to the M80s, but it isn't dramatic. There seems to be little or no difference in detail; they are very, very similar.

In a bigger room, when you are farther back, the M80s also sound a bit more authoritative than the M60s, but otherwise the big difference is maximum output and power handling.

Regards,

Alan Lofft,
Axiom Resident Expert (Retired)