JBL Duet Speaker System for Portable Music and PC - White (Pair) 2-channel speaker system for use with portable audio devices Generates smooth and accurate sound for handheld MP3 players and CD players Patent-pending TSR technology improves bass and lowers distortion 60 Hz to 20 kHz frequency response; &gt;70 dB signal-to-noise ratio 12 watts total power (6 watts x 2)