CONSTRUCTION AND FINISH
All boundaries of a reverberation chamber should be of exceptionally rigid
construction. Concrete or heavy t11e is ideal. If the chamber is to be of frame
construction the studs should not be over fourteen inches on centers. Lath should be
very securely nailed and the plaster should be hard and given a smooth finish coat.
TONE OPENINGS
The reverberation time of an organ chamber is greatly influenced by the size of the
tone opening. For a chamber of given dimensions, the reverberation time is increased
as the area of the tone opening is reduced. A large chamber, therefore, may have a
large tone opening and still furnish sufficient reverberation, whereas a small
chamber might require a very small opening. A chart is shown in Figure 1, giving the
area of tone opening required to furnish one second reverberation time when the
volume of the chamber is known. This chart is for chambers with dimensions in the
ratio of 2 : 3 : 4 ½ only; however, in practice the areas of tone opening shown are
generally satisfactory. The tone opening should be located in the largest wall
surface of the chamber if possible, and preferably near the center of the wall area.
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