Passive Volume Controller Mini Passive Preamp Active Speaker Volume Adjustment Controller Professional Audio Equipment _x000D_ Features: This volume control allows you to adjust the volume of your speakers effortlessly. Its RCA interface ensures lossless output, allowing you to enjoy your favorite music without any signal degradation. With its passive design, it eliminates the need for an external power supply, making it incredibly convenient._x000D_ The volume adjustment adopts a professional 128mm pusher volume switch, which has a small accuracy error and better synchronization of the left and right channels, with no loss of sound details._x000D_ The appearance is made of all metal materials, with a precision steel casing. The compact size is suitable for any system and is compatible with all types of playback devices and external active speakers._x000D_ _x000D_ Specifications: _x000D_ Input Channel: Supports 1 set of stereo lotus head interface inputs _x000D_ Output Channel: Supports 1 set of stereo lotus head interface output _x000D_ Volume Adjustment: Using a professional 128mm push switch _x000D_ Signal to Noise Ratio S/N: Greater than 98dB _x000D_ Output Gain: 0dB _x000D_ Output Loss: Less than 0.01dB _x000D_ Distortion: Less than 0.002% _x000D_ Frequency Response: 10Hz-50kHz _x000D_ Input and Output Impedance: 10-50k _x000D_ Input/Output Interface: The input/output adopts a gold-plated lotus head interface _x000D_ Power supply: No external power supply required, directly plugged in for use._x000D_ Material: Metal_x000D_ colour: black_x000D_ _x000D_ Package Contents:_x000D_ 1 x Passive Volume Controller_x000D_ _x000D_ Only the above package content, other products are not included._x000D_ Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm._x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_