Paul, welcome. As a highly satisfied M22 owner for almost 8 years now, I can assure you that for most music a sub isn't essential with them. In-room, my measurements show strong bass down to about 50Hz and much lower, but still usable response around 40Hz. I now use the EP500 sub I got about three years ago full-time for very low frequencies(e.g., pipe organ, some movie low frequency effects)and for even better bass response in the 40-80Hz octave. However, on most music the bass is very satisfying with the M22s alone, and I highly recommend them for such use.
