Universal Car Audio Amplifier Bass Controller Knob with RCA Input for Volume Gain and Frequency Adjustment Features： 1、Easy Power and Frequency Control: With the RCA Bass Controller, simply rotate the bass knob to control and adjust the bass gain or frequency. This allows you to balances multiple amplifiers, change musics styles, and enhance your audio experience with precise bass control. 2、Remote Bass Control: This remote bass control knob enables quick and convenient control or adjustment of bass, gain, and volumes from the front seat or a remote location. No need to reach for the amplifier or navigate through complex menus. 3、Versatile Connectivity: The gain controller features 2 RCA inputs and 2 RCA outputs, along with 2 control knobs. The frequency ranges is between 150Hz-40Hz, and the gain can be adjusted from 0dB to -12dB. Simply connect the RCA input and output interfaces between your audio source device and amplifier. 4、Wide Application: The car amplifier bass controller knob is widely compatible with car audio amplifier systems and suitable for most vehicle. It is designed with nice durability and wear resistance, ensuring long-lasting practicality. 5、Enhance Your Audio System: With the Bass Controller for Speakers, you can fine-tune your audio system to achieve the balances of bass and volumes. Experience deep, rich bass and take your audio enjoyment to the next-level. Specification： Features: Easy Power and Frequency Control: With the RCA Bass Controller, simply rotate the bass knob to control and adjust the bass gain or frequency. This allows you to balances multiple amplifiers, change musics styles, and enhance your audio experience with precise bass control. Remote Bass Control: This remote bass control knob enables quick and convenient control or adjustment of bass, gain, and volumes from the front seat or a remote location. No need to reach for the amplifier or navigate through complex menus. Versatile Connectivity: The gain controller features 2 RCA inputs and 2 RCA outputs, along with 2 control knobs. The frequency ranges is between 150Hz-40Hz, and the gain can be adjusted from 0dB to -12dB. Simply connect the RCA input and output interfaces between your audio source device and amplifier. Wide Application: The car amplifier bass controller knob is widely compatible with car audio amplifier systems and suitable for most vehicle. It is designed with nice durability and wear resistance, ensuring long-lasting practicality. Enhance Your Audio System: With the Bass Controller for Speakers, you can fine-tune your audio system to achieve the balances of bass and volumes. Experience deep, rich bass and take your audio enjoyment to the next-level. Specifications: Color: Black Material: Metal Item Size: 50 * 40 * 55mm/ 2.0 * 1.6 * 2.2in Package Size: 80 * 60 * 60mm/ 3.1 * 2.4 * 2.4in Package Weight: 200g/ 7.1oz Packing List: 1 * Bass Controller Package List： 1 * Bass Controller