Usage Tips:[9 Bands]: The car audio equalizer has 9 equalization bands (50Hz 100Hz 250Hz 500Hz 1KHz 2KHz 4KHz 8KHz 16KHz), intelligent noise reduction, accurately adjusted, and the subwoofer frequency can be adjusted from 30Hz to 120Hz. [6 Channel Outputs]: This 9 band equalizer supports front left right channels, rear left right channels and 2 subwoofer output channels. The independent subwoofer output and adjustment function enhance the sound experience in the car. [2 Channel Inputs]: The car audio equalizer support CD and Aux inputs, with the gain knob to adjust the aux volume, providing better sound quality. [Durable Material]: The equalizer adopts metal shelling, DC 12V powered, has high texture, is easy to operate, and has a long service life. [Easy Installation]: The audio equalizer is suitable for cars, boats, RVs and other stereo tone controls, easy to install. Built in DSP chip, reduces howling interference, prevents noise, and makes the sound effect clear and high fidelity. Power supply: 12V DC Maximum output voltage: 8V RMS Leveling range: 12dB Subwoofer frequency: 30Hz-120Hz Colour:Black Material:Metal+plastic Package Contents: 1 x Car Audio Equalizer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.