QSC USA 900 Two-Channel Power Amplifier. Excellent working order with minor cosmetic wear from use/storage. Specifications: Power output: 240 watts per channel into 8ohm (stereo), 900 watts into 8ohm (mono). Frequency response: 20Hz to 20kHz. Total harmonic distortion: 0.1%. Input sensitivity: 1.16V. Signal to noise ratio: 104dB. Speaker load impedance: 4? Dimensions: 19 x 5.25 x 9.5 inches.