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Pyramidal diffusors are suspended over this Choral Room to aid
sound dispersion and mixing. Variable acoustics curtains along
the upper walls allow reverberation time to increase when the
curtains are retracted and decrease when the curtains are deployed.
Similarly, variable acoustic doors on the lower walls increase
and decrease the amount of exposed sound absorption. Lastly,
the main lower wall is treated heavily with sound diffusion
for ensemble and balance.
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Choral Room
Download PDF Version of Guidelines
The primary acoustic goal for a Choral Rehearsal Room is to provide an adequately reverberant room that blends and reinforces the choral music, but also permits critical listening and intelligible direction from the choral director. This goal can be achieved by providing diffusion over and in front of the choir and diffusion/reflection on the side walls flanking the choral risers and behind the choir.
| Ceiling | The ceiling should be approximately 30% diffusive, 30% absorptive, and 40% reflective. Diffusion should be accomplished with RPG Omniffusors. Absorption should be accomplished with standard ACT having a noise reduction coefficient of NRC-0.65 or higher. Reflection should be achieved with a double layer GWB soffit around the perimeter of the room. The soffit should be between 14’ and 16’ above the finish floor and the central ceiling of RPG Omniffusors and ACT should be between 16’ and 18’ above finish floor. The Omniffusors
should be grouped together in modules 3 units wide by 3 units
long (6’x 6’) with Omniffusor modules spaced apart
by 2’ wide bands of ACT tiles (both directions) for implementation
of air diffusers, lights, etc. |
| Upper Walls | Approximately 50% of the upper side and rear walls (above 12’-0”) should be treated with RPG BAD Panels. Use 2” thick RPG BAD Panels if the walls are gypsum board. Use 4” thick panels if the walls are concrete. The rest of the upper side and rear walls can be painted, split-face block. The upper portion of the front wall (facing the choir) should be sound diffusive and angled down out of vertical so that it is perpendicular to the center of the choral risers. This wall surface should be treated with RPG FlutterFree planking. |
| Lower Walls | The lower portions of the side and rear walls (below 12’-0”) should be primarily diffusive (75% of lower wall area). The most economical option is RPG DiffusorBlox (nonslotted, painted). The remaining wall area should preferably be split-face block, but standard painted CMU or painted GWB is minimally acceptable. |
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2000, RPG Diffusor Systems, Inc. |