Sennheiser's AUDIOBEAM Ultra-Directional Loudspeaker with Power Supply Case lets you direct sound exactly where you need it. These versatile speakers are well suited for public and private applications. Sennheiser uses ultrasound technology to focus both high and low ends of the sound spectrum exactly where you need them. This specialized audience targeting is so effective that if someone is positioned next to or directly behind the speaker they hear no sound at all, but the listener in front of the speaker gets top notch audio. An added feature is the ability to direct a beam of audio off a reflective surface and create the illusion that the surface is producing audio. Consider the possibilities for art exhibits, museums and other informational displays. Directed Audio Beam audio directly to your audience while keeping surrounding areas unaffected by the presentation.