Features: 1.5 EQUALIZATION BANDS: Car amplifier graphic equalizer adjustable from ?12 to + 12db. Subwoofer frequency adjustable from 50Hz to 130Hz. 2.CD AUX INPUT SELECT SWITCH: 5 band car equalizer allows for CD and auxiliary (2 channel) inputs with gain knob to adjust auxiliary volume, CD and AUX input buttons also allow flexible switching to the other input. 3.CLEAR TRANSMISSION: Powered by a 12 volt supply and featuring 6 channel front, rear, and subwoofer auxiliary stereo outputs, it enhances your sound experience in the car. This ensures that your amplifier and speakers receive a powerful yet clear signal. 4.FLEXIBLE CONTROL: 5 band car sound equalizer supports subwoofer volume control, subwoofer frequency control, fader control, and various Hz controls. 5.STURDY METAL CHASSIS: Adjustable 5 bands EQ is powered by a DC 12V power supply. Rugged metal chassis and knobs for all controls enhance your cutting edge feel. specification:Item Type: 5 Band Car Sound Equalizer Material: Metal Subwoofer Frequency: 50-130hz Input Impedance: 15K OHMS Signal To Noise Ratio: 90db T.H.D.: 0.05% Channel Separation: 70db Frequency Response: 10hz-50khz PackageList:1 x 5BandCarSoundEqualizer 2 x Iron Piece 4 x Screws