This is a great amp, 150 watt ,5 channel amp with surround sound , this is a marantz mm9000 150 watt per channel and it's a 5 channel amp .it's amazing this price is firm , what you see is what you get ..thank you. There is nothing wrong with the amp its in perfect working condition THIS AMP WILL PUSH THOSE SPEAKERS TO THE MAX AND STILL HAVE POWER TO GOOOOOO !!!!! AND THE SOUND IS MIND NUMBING. Condition: Good,. Amplifier Section Continuous power output (RMS) into 8 ohms (<.03% THD, 20 Hz - 20 kHz) Front left and right channels 150 + 150 W Center channel 150 W Surround channels 150 + 150 W Input sensitivity 100 mV/1 W Output Input impedance 20 kΩ Frequency response (-1 dB) 5 Hz to 100 kHz Signal to noise ratio 95 dB General Power requirements 120 V, 60 Hz, 400 W Dimensions W/H/D 175 ⁄16” x 65 ⁄16” x 74 ⁄5” 159mm x 440mm x 452mm Weight 44.1 lbs. 20 kg.