The Connection SLI 2.2 High-to-Low Level Conversion Interface enables seamless OEM integration into automotive audio systems by converting high-level speaker outputs into low-level RCA signals. This interface features 4 inputs and 2 output channels, making it ideal for integrating aftermarket amplifiers with factory radio units. With an input impedance of 200 ohms and an output impedance of 400 ohms, the device ensures proper signal matching and prevents distortion. The frequency response range of 15 to 40,000 Hz covers the entire audio spectrum for clear, detailed sound reproduction. The robust construction with durable components and a black finish maintains signal integrity while providing reliable performance in vehicle environments. Its compact design allows for flexible installation behind dashboards or in tight spaces. Professional installers appreciate this interface for its ability to retain factory functions while upgrading audio systems, eliminating the need for complex wiring modifications. The SLI 2.2 model represents an advancement in signal conversion technology, building on previous designs with improved impedance matching and frequency response characteristics. This product is specifically designed for automotive electronics applications where maintaining OEM functionality while enhancing sound quality is essential. The interface works effectively with most factory audio systems and aftermarket amplifiers, offering a straightforward solution for audio system upgrades without compromising vehicle electronics.