Logitech X540 Installation Guide - Page 6

Enjoying your Logitech® X-540 Speakers Access these controls on the wired remote control: Power Switch between standby ("off") and on. Volume Adjusts the overall system volume. Bass Adjusts the subwoofer volume (bass level.) Matrix Turns on Matrix mode. Use this button when you want to create 5.1 surround sound from 2-channel stereo sources like music and video game consoles. Headphone Jack When headphones are used with your X-540 system, the speakers will mute automatically for private listening. Headphone volume is controlled by the soundcard on your computer. Dolby® Digital The X-540 speakers support Dolby® Digital sound on your PC if your 6-channel or greater sound card or DVD software can decode a Dolby® Digital soundtrack.  English Setup - Operation