KEF X300A Wireless Digital Hi-Fi Speaker System - Gunmetal Grey (Pair) There's no software to load and no fiddly programming when it comes to setting up the X300A. Just connect the speakers to one another, flip the power switch before connecting to your audio player of choice, and plug in via USB or an 1/8" input With high resolution 96kHz/24-bit USB input and digitally connected hi-fi speakers, the X300A gives your music all the warmth, depth and detail of the original recording. Each X300A speaker has two dedicated class AB amplifiers - one for LF/MF and one for high frequencies - to ensure accurate, distortion-free sound reproduction. The X300A comes with a built-in switch that allows you to adjust the bass according to whether the speakers are sitting on a surface, or are sitting on stands. A high quality DAC in each speaker virtually eliminates interference and is complemented by the award-winning Uni-Q 'point source' driver array derived from our flagship speaker, the Blade. The result is a spacious, accurate and exquisitely detailed sound field, whatever device your music is played from.