specs from the ebay listing I saw for a ver 2 Matrix M-Stage:
Frequency Response: 10 Hz (-0.3dB) ~ 35kHz (-1dB)
Signal to Noise Ratio: >95dB (0dB)
Distortion: <0.001% (6 mW/300 Ohms)
Input Impedance: 47 kOhms
Output Impedance: Line-out 60 Ohms, Phone-out 5 Ohms
Output Power: 200 mW/300 Ohms, 400 mW/60 Ohms
Power Support: AC 220-240V/100-120V (Please specify)
Front Panel Color: Black/Silver (Please specify)
Weight: 2 kg
Device Dimension: 280 x 110 x 42mm
Seriously though, a 15 page review for a $250 amp?