gain adjustable from 0db to 75db output level: +4dbu nominal, + 27dbu maximum (balanced) signal to noise ratio: (ein / 150 ohms) 128 db high pass filter: 35hz to 600hz @ 12 db per octave low pass filter: 1khz to 18khz @ 12 db per octave frequency response +/- 1db: 7hz to 30khz at maximum gain distortion at 1khz: 0.001% input impedance: 1.2kohm (constant impedance)