Hi Urban,
I've not heard of a Sonic Impact Super T-amp. Is this a vacuum-tube device, given its tiny output? The M22s when fed with a clean signal from a well-designed solid-state amp or receiver (any Denon, H/K, NAD will be fine) will not sound harsh unless the source recording is harsh.
The EP125 is meant for rooms of modest size--dens, bedrooms or small living rooms, and in that setting it performs exceedingly well with any main channel Axiom bookshelf models. If your room is 2,100 cu. ft or larger, get a subwoofer like the EP175 or EP350 with a 10-inch or 12-inch driver, or something from Hsu.
I suspect your Super-T amp may not be linear (if it's a tube device it won't be; the output iimpedance will interact with M22's impedance curve and alter frequency response). If that happens, even a few dB variation in the midrange response can make an otherwise smooth and detailed speaker sound recessed or aggressive.
Try borrowing a good solid-state amp of the aforementioned brands, one with lots of power in reserve (at least 50 watts per channel or more) and known very low distortion levels and then see how the M22s sound. If you need recommendations for really good source recordings, you'll get lots of suggestions from everyone here.
Regards,
