Going by Axiom's listed frequency response for the M60s (37 Hz, -3db) and the NRC's frequency response measurements for the M80 (~40 Hz, -3db), I'd say maybe. Flat response to ~40 Hz is good enough for most music, but you'll want a sub for that extra "oomph" for HT and some gospel and R&B...
Hi Michael, Try looking into Rutledge Audio's T1 tower speaker. http://www.rutledgeaudiodesign.com/t1.html I have a bookshelf version of this speaker (the SCH K05B50, I believe), and it, when paired to my subwoofer, excels at jazz, gospel, and mostly anything else you can throw at it...