The MBX-PRE Streaming Audio Player is designed to offer a simple-to-install and simple-to-configure streaming media solution to add high quality streaming audio content to any audio system. The MBX-PRE can be used as a single stereo audio streaming source for a single room, or supply a single audio stream to a larger whole-house system through its easy-to-use analog line-level/digital (coax/optical) outputs. The MBX-PRE allows for expansion to up to 32 streaming rooms of audio in a single installation with any combination of other MBX-Series streaming products from Russound. When paired with a Russound multi-room controller, system expansion is possible up to 8 independent audio sources and up to 48 total rooms of audio. In addition to offering streaming audio from popular internet sources, the MBX-PRE also offers streaming of local UPnP™ compliant audio.In addition, a built-in USB port allows users to connect an external flash drive or an externally powered USB hard drive for use as additional music sources.