Gain Range +-12dB Type of Circuitry FET Input OP-Amps w/ Discrete Gyrators Input Impedance 1M Ohm Output Impedance 1K Ohm Max Output before Clipping 2.6Vrms Hum and Noise -92dBV THD @ 1Vrms out @ 1 KHz 0.002% EQ Center Frequencies Bass - 30Hz; Mid - 650Hz; Treble - 5.2KHz Slap Contour Frequencies 6dB @ 80Hz; -6dB @ 650Hz Outputs 1/4” single ended @ -10dBu average level XLR balanced @ -20dBu average level Current Consumption 2.9 mA Max External dimensions 5.50x5.20x2.20 inch.(140x132x56 mm) Weight 1.9 Lbs Chassis Material 1.6mm Steel Power DC 9-12V; Battery or Regulated DC Adapter