Dangerous Music Monitor SR. Surround expansion module for Dangerous Monitor ST, providing full 5.1 capability. You can start in stereo with the Dangerous Monitor ST and expand to surround later, simply by adding the Monitor SR. No redundancy or obsolescence! All four inputs can be surround or stereo sources. Internal routing, allows effortless switching between stereo and surround operation with seamless sharing of a front pair of speakers and subwoofer. 19", 1RU.