Modern vehicles pose challenges for integrating aftermarket audio components. Many lack the option to replace the factory radio with a better-sounding alternative, leaving you to connect your system to factory speaker leads that are often not full-range and frequency-limited. But don't give up yet. The SRI is an easy-to-use, compact, and highly effective signal summing module that combines these dedicated, limited-frequency leads into a full-range, usable signal, enabling you to build your dream audio system. The initial setup is simple: insert the provided CD into your music source and adjust dials until they turn green. After that, the possibilities are endless.