SubMatch connectivity is a proprietary technology invented by Bose to connect the Sub1 or Sub2 Powered Bass Module to the L1 Pro32 Portable Line Array - or to daisy-chain an additional Sub1 or Sub2 to the system. A SubMatch Cable is included with each L1 Pro32 line array and delivers both power and audio from your L1 Pro32 to your Sub1 or Sub2 subwoofer, making setup easier and allowing the system's crossover and EQ to automatically calibrate for optimal sound. And if you want to connect a second Sub1 or Sub2 to your L1 Pro32 system, all you need is a second SubMatch Cable.