Audio/Visual System Design

With large auditoriums and churches, longer reverberation times are needed to support music. In boardrooms and classrooms, the exact opposite is required. Short reverberation times as well as low ambient and HVAC noise levels are mandatory in establishing high speech intelligibillity levels. Consequently, a high amount of isolation from adjacent spaces is also required since the lower the ambient noise level in a room, the more apparent the sound leakage from adjacent rooms will become. This is especially true with today’s distance learning classroom and meeting spaces.

Proper selection of all sound and video equipment is especially important. For example, the projection screen maybe front or rear projection depending upon space requirements and lighting conditions. Exact specifications must be determined to enable proper viewing within the room. Too narrow a viewing angle (a high screen gain) and the viewing angle may not be propper for all to see. Too wide a screen angle (a low screen gain) or an improper selection of projector may result in a picture that might not be bright enough to read unless all room lights were off. Placement of the seating area to close to the screen will prevent a clear picture to a person in that seat while the person at the rear of the room may not be able to see simply because the screen size is too small or the screen is not positioned correctly.

A good design should take the following consideration:
• Space Allotments
• Current and future uses of the room
• Number of people
• Lighting situations
• Outboard equipment needed to carry out the room requirements
• Power requirements of the room
• Equipment storage
• HVAC loads for equipment and personnel

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