RMS Power Output: 300-Watts x 2/900 (mono-bridged @ 8 Ohms) RMS Power Output: 490-Watts x 2/1200 (mono-bridged @ 4 Ohms) RMS Power Output (2 Ohms): 600-Watts x 2 Preamp: Tubes (3 x 12AX7) Power Amp: Solid State Tone Controls: 3-Band Mid Tone Control: 5-Position Graphic EQ: Yes, 9-Band Ultra Low/High Boosts: Yes Balanced Line Out: Yes x 2 Pre/Post with Level Effects Loop: Yes x 2 Preamp Out/Power Amp In: Yes x 2 Dimensions (W x H x D inches): 19 x 5.6 x 15.5 Weight: 39.5 Pounds