Four full-range woofers ensure you’ll hear the faithful playback of mid-range vocal frequencies plus deep, rich bass. One tweeter creates a crisp and clear dialogue. Three passive radiators help move air around inside the compact Sonos Beam and add warm sound to the bass. Adjustable bass and treble controls let you customize your sound by individual room or groups of rooms Five far-field microphone array used for advanced beamforming and multi-channel echo cancellation When the microphone LED is on, Alexa is ready for a voice command. When the light is off, the microphone is off. HDMI Cable connects to your TV’s HDMI ARC input. Optical Audio Adapter to connect to your TV. Capacitive touch controls for volume up/down, previous/next track, play/pause, microphone mute. LED indicates status, mute status and voice feedback.