Power Supply : 11-15V DC NEG . GROUND MAX . OUTPUT VOLTAGE : 7V RMS PRE GRAPHIC FREQUENCY : 40 Hz, 200 Hz, 2KHz, 20KHz EQUALIZATION RANGE : +/- 12 dB SUBWOOFER FREQUENCY : 30/300 Hz INPUT IMPEDANCE : 15K OHMS S / N RATIO : 90 dB T . H . D . : 0.05% CHANNEL SEPARATION : 70 dB FREQUENCY RESPONE : 10 Hz-50 KHz, -3dB