Suitable for 4-pin line, 12V power amplifier equipment. Enhances your auto sound experience with this bass knob, a general car amplifier volume control designed for precise bass and volume adjustments. This knob features simple in/out connections for easy installation, allowing you to adjust gains and frequency without the need for additional wiring—ideal for ophiles seeking optimal sound quality. Suitable for music enthusiasts and professional sound producers who demand convenient control over their car's o system while on the move. Whether cruising on a long road trip or enjoying your favorite tracks during daily commutes, this bass knob ensures your sound is tailored to your preferences. The bass knob not only complements vehicles with its design but also offers a responsive interface for quick sound adjustments, making it an essential accessory for any auto sound upgrade. Size: about 5 x 7 cm / 1.97 x 2.76 inches Cable length: 5 m Color: Black Material: Plastic Package Contents: 1 x Car Amplifier Volume Control Cable Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the real thing. Measurement allows an error of +/- 1-3 cm.