Specifications:

Power:
MF2550 250 Watts per channel from 20 Hz to 20 KHz at no more than 1.0% THD or IMD, both channels driven into 8 ohms.
MF2275 135 Watts per channel from 20 Hz to 20 KHz at no more than 1.0% THD or IMD, both channels driven into 8 ohms.
Sensitivity:
MF2550 2.0 Volts rms to rated power
MF2275 1.35 Volts rms to rated power
Frequency Response (at 10 Watts):
20 Hz to 20 kHz, +/- .1 dB
Hum and Noise:
100 dB below rated power Input
Impedance:
100 KOhms
Dimensions:
MF2550 16.25D x 19W x 6.125H inches
MF2275 14.625D x 19W x 4.875H inches
Weight:
MF2550 52 lb. net
MF2275 33 lb. net