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 high-quality sound performance. Suitable for music enthusiasts and professional sound producers who want convenient control over their car o system while on the move. Whether on a long road trip or enjoying music during daily commutes, this bass knob ensures sound is tailored to your preferences. The bass knob complements modern vehicle interiors with its design and provides a responsive interface for quick sound adjustments, making it a useful accessory for auto sound upgrades. Head size: approximately 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: Only the items listed above are included. Other products are not included. Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement allows an error of +/- 1-3 cm.