7 BAND Pre Amp Kereta - *Power Supply : 11 - 15V DC NEG. Ground - *Max Output Voltage : 7 V RMS - *Pre Graphic Frequency : Bass , Mid Bass, Mid, High - *Equalization Range : +- 12dB - *Subwoofer Frequency :30-250 HZ - *Input Impedance : 20K OHMS - *S/N Ratio : >105dB - *T.H.D : 0.01% - *Stereo separation : >-60dB - *Frequency Response : 10Hz - 50KHz (+- 1 dB) Car Pre-amplifier Equalizer with Subwoofer Crossover Adjustable 3S special sound effect in three mode Improving audio dynamics of music Dramatically enhancing 3D effect of cinema Making clear and accurate voice Active gain preamplifiers with adjustable input sensitivity Master volume control with up to 9V RMS of output Built-in subwoofer crossover with level and frequencies control