Hi Cork,
As Mark has pointed out, the anechoic curves are somewhat misleading in terms of useful audible bass output in a room, which always extends lower because of boundary reinforcement (walls and floor of the room).
The M22s have useful output to 40 Hz--that's the bottom string on an electric or acoustic bass. (If you want to test that, turn off your sub and play some rock/pop or jazz recordings and listen to the bass.) You'll definitely hear the 40-Hz low string, but it won't be nearly as loud as you'd get from, say, an M60 or M80 floostanding tower run full-range. Or from a good subwoofer married to the M22. With a good sub and the M22s, the best default crossover frequency is usually 80 Hz, but feel free to experiment.
Regards,
Alan
