Compact System, Clearly Good Sound. Thanks to its internal amplifier and a pair of separate speakers, the compact PM272 is big on performance. The speakers feature 10cm full-range drivers with bass reflex ports to comfortably deliver 20 watts of stereo sound. The Small System that's Big on Choice. Love the sim. SC-PM272EB-S Bluetooth CD Micro HiFi System - Silver. 10cm Speaker System with Bass Reflex Port, Bluetooth Connectivity, 20W Stereo Sound, CD Player, DAB & FM Tuners, Silver Finish.