If the sub has a built-in crossover, you can feed the OMNI OUT to the sub. Adrian Thomas Music Services On Apr 6 2014, kevinweng99@... wrote: Hello, I enjoy my DC3M4. Recently I have realized if I can extend the playback to a subwoofer, it will make the sound more wonderful. Has anyone attempted that? I couldn't find any diagram or mentioning of subwoofer in the manual. Thanks, Kevin