GRAVITY 7 Band Graphic Equalizer GR-EQ9 Power Supply: 11-15V DC | Max Output Volt: 7V RMS PRE Graph Frequency 50Hz - 16kHz Equalization Range: +-12dB | Subwoofer Equalizer: 60/90Hz | Input Impedance: 15k Ohms Signal To Noise: 90dB | T.H.D. AT 0.05% | Channel Division: 70dB Frequency: 10Hz-50kHz