Hear and feel the difference by adding the powerful sub-woofer to the Sonos audio system! A special system vibrates the air at the same time eliminating any cabinet rattle to fill the room with distortion-free and powerful bass. No unwanted noise or rattle. Thanks to the ingenious design, this 16kg device can be enjoyed horizontally or vertically for invariable top-quality sound. When the Sub is connected to smaller speakers, it takes over the lowest frequencies, enhancing the midrange playback.