7 Band Car Amplifier with AUX CD Input for Boat RV - Graphic Equalizer 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.