Bob, the M22s aren't "power hungry"; they're at the average point for speaker sensitivity. To allow for the 105dB level set as the maximum "reference" in movies would require about 100 watts in a typical room at home at a typical listening distance of about 10 feet. A similar amount of maximum power capacity would be needed for brief peaks in highly dynamic music recordings, such as some classical items.
Any of the usual receivers having a rating anywhere in the 100-150 watt area would be ample for this.
