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that, in competition gyms, the designer must often comply with sports regulations that may force the loudspeakers to be
at or above the ceiling girders.
Distributed Ceiling System
A distributed system, although not the lowest-cost design, offers the best way to achieve these goals. It puts the loudspeakers as close as possible to the listeners and aims them directly at the listeners, away from the walls and ceiling. This
design has two rows of loudspeakers, facing downwards, covering the floor and a row of loudspeakers, angled slightly outwards, covering each area of bleachers.
Multi-Purpose Usage
Gymnasiums are often multi-purpose spaces used for sporting events, pep rallies, concerts and dramatic performances and
school assemblies. For non-sporting events, a portable stage may be brought in and placed at one end of the gym floor.
To minimize feedback, provide switches to turn off loudspeakers pointed at the stage location(s). Also consider a switch
to turn off the loudspeakers over the floor. This keeps reverberation down when there’s no need for floor coverage.
Alternate Loudspeaker Choices and 70/100 Volt Systems
Add R.5SUB or R2SUBZ loudspeakers for extended low frequency response when students want “hip-hop” or “rock ‘n’
roll” musical performance. R.5 loudspeakers are available in 70/100-volt versions, as used in this example. However, if
wire runs are short enough, it may be possible to use standard versions at a slightly lower cost. Choose amplifiers that
are rated for the resulting very low impedance load.
As a lower-cost, alternate design, substitute Community’s R.25-94TZ for the R.5-99TZ. The R.25 will cover the area well
but at a lower level than the R.5.
R-SERIES LOUDSPEAKERS USED IN THIS DESIGN
R.5
Qty
Model
16
R.5-99TZ
System Cost Estimate - $$$
Comments
For coverage of all areas (70/100 volt transformer included)
Based on cost comparison scale: $ = lower cost, $$$$$ = higher cost
Community R-Series Application Guide — Page 31