The SD4 SuperDispersion Ceiling Speaker Array offers flawless performance, value and are ideal for Classrooms, Conference Rooms, Training Rooms, Teleconferencing, Churches, Retail Spaces, Corporate Offices and many more. Conventional speaker designs radiate sound in a limited conical pattern similar to a flashlight pattern of directional sound. Low frequency sounds are radiated out but the critical higher frequencies that contribute to voice and music reproduction narrow and beam directly underneath or in front of the speaker. In order hear full range sound over a wider dispersion pattern many more speakers become necessary adding greatly to the cost. The Ceiling Speakers are uniquely engineered to overcome these limitations by radiating high, mid and low frequency sound equally over a wide coverage area. This wide, full range dispersion is created by a precisely engineered design and cohesiveness' of the high-performance drivers working in unison to create an omnidirectional in ceiling loudspeaker. The SD Speaker employs (4 smaller 6.5) very fast transient response aluminum-woofer drivers that are very powerful and stable. Working in unison these drivers produce clean powerful dynamic sound. When designing the SD the goal was to have the single most import feature at the forefront, good transient response ("dynamic contrast"). A transient is a sound of short duration, and good transient response can only be achieved if the speaker can deliver its output quickly and cleanly without smearing the original sound, and be completely soundless immediately after. Transients contain the essentials of sound reproduction they provide the sharp pop from a snare drum, the cutting edge of digital sound, the dynamics of the human voice. Larger 2-way cabinet loudspeaker systems offer relatively slow transient response, and the small high-frequency horn tends to beam a narrow, blaring sound at the listener-end result, muddy sound.