Features: 1.Adjustable: The car sound equalizer features 7 equalization bands (50Hz, 125Hz, 315Hz, 750Hz, 2.2kHz, 6kHz, and 12kHz) that are adjustable from ?12 to + 12db. Subwoofer frequency adjustable from 50Hz to 130Hz. 2.Powerful: Enhance your in car sound experience with 6 channel front, rear, and subwoofer auxiliary stereo outputs. This ensures that your amplifier and speakers receive a strong but clear signal. 3.CD And AUX Inputs: Allows for CD and Aux (2 channel) inputs with a gain knob to adjust the AUX volume, and CD and AUX input buttons for flexible switching to another mode input. 4.Multi Function Controls: This 7 band equalizer offers flexible controls including subwoofer volume control, subwoofer frequency control, fader control, and various Hz controls. 5.Professional Design: The car amplifier graphic equalizer is powered by a DC 12V supply. In addition, the rugged metal chassis and premium knobs for all controls enhance your experience. specification:Item Type: Sound Equalizer Material: Metal Equalizer Bands: 50Hz, 125Hz, 315Hz, 750Hz, 2.2kHz, 6kHz, and 12kHz Subwoofer Frequency: 50-130Hz Input Impedance: 15K OHMS SNR: 90dB Total Harmonic Distortion: 0.05% Channel Separation: 70dB Frequency Response: 10Hz-50kHz PackageList:1 x Sound Equalizer 2 x Iron Pieces 4 x Screws 1 x User Manual