Yamaha MSR250 Powered Speaker by Yamaha. $399.99. The MSR250 is a 200-watt powered loudspeaker system designed for all around sound reinforcement use. The high impact molded enclosure is a bass-reflex design with a 10” woofer and a 1”titanium high frequency driver that can be used as a main speaker or as an onstage monitor. The built-in 200-watt power amplifier provides amazing audio output from a lightweight, small, easy to transport package.. Save 33% Off!