Car Amplifier Volume Regulator Speaker Bass Controller Car Audio Amplifier Sound Adjuster Subwoofer Amplifier 27.5cm 12V Two adjustment modes - The volume converter has two adjustment methods, either through enhanced adjustment or through frequency adjustment. Only need to gently rotate the buttons of the controller, different frequencies can make the song sound different. Very convenient and easy to adjust. Good material - The controller is made of copper core and plastic. The copper core has good conductivity and can realize the best signal transmission. And the controller is easy to install without additional wiring. Versatility - The audio controller is a universal car amplifier bass controller and regulator. Stereo RCA input/output, the conversion effect is more obvious, the difference can be heard at any time. Practicality - You can change different styles of songs by gently rotating the buttons of the controller, and different frequencies can make the songs sound different. Very suitable for music lovers. Applicability - The universal car speaker bass controller is ideal for balancing systems to change the music style. No changes will be made to the original system, you can use it with confidence. Specification: Material: Copper Core Color: Black Voltage: 12v Total Length: 27.5cm The Distance Between The Mounting Holes: 4.4cm Product List: 1 * Car Audio Amplifier _x000D_