1、7 Equalization Bands: 50Hz, 125Hz, 315Hz, 750Hz, 2.2KHz, 6KHz, 12KHz, adjustable between ‑18dB to +18dB The subwoofer frequency is adjustable between 35Hz and 250Hz. 2、Stereo Outputs: With 6 channel front, rear and subwoofer auxiliary stereo outputs, you can enhance your sound experience in the car. This ensures that your amplifier and speakers receive a powerful and clear signal. 3、CD and AUX Inputs: Allows CD and AUX (2 channel) input with gain knob to adjust auxiliary volume, and CD and AUX input buttons for flexible switching to another mode input. 4、Flexible Controls: Subwoofer volume control, subwoofer frequency control, fader control, various controls. The car equalizer is powered by a DC 11‑15V power supply. 5、High Performance: Multifunction, sturdy metal chassis and quality knobs are available for all controls. Item Type: 7 Band Car Audio Equalizer Material: Iron Box Model: K 771 Color: Black Power Supply: 11-15V DC, Negative Ground Pre Graphic Frequency: 50Hz, 125Hz, 315Hz, 750Hz, 2.2KHz, 6KHz, 12KHz Equalization Range: -18dB To +18dB Subwoofer Frequency: 35-250Hz Input Impedance: 10KΩ SIN Ratio: 90dB T.H.D: 0.05% Channel Separation: 70dB Frequency Response: 15Hz-30KHz (-3dB) Applications: For Boat RV RTV Motorcycle Car Stereo Control 1 x Equalizer 2 x Bracket 4 x Screws 1 x User Manual