7 Band Pre Amp-Parametric With Subwofer Power Supply : 11-15 Volt Dc,NeG,Ground Max Output : 11Volt RMS Pre-Graphic Frequency : 50Hz,125Hz,315Hz,750Hz,22khz,6khz,12khz Equalizer Range : +- 18dB Subwofer Frequency : 35-250hz Input Impedance : 10K ohm S/N Ratio : 90dB Channel Separatition : 70dB Frequency Response : 15Hz-30Khz