The use of this device also eliminates the necessity of costly reverberation
chambers, and by allowing the tone cabinets to be so located as to minimize sound
energy losses, a saving in the amount of necessary power equipment is often
effected. A further advantage is that the reverberation time may be regulated for
best musical results after the organ is installed. With the use of the Hammond
Reverberation Unit a good organ installation should always result if the tonal
equipment is placed to give even distribution and proper tonal balance.
REVERBERATION CHAMBERS
When it is desired to conceal the organ tone cabinets and there is adequate space
available, a properly designed reverberation chamber may be very effective in
supplying reverberation for the organ tones. In many cases, however, the space
allotted for use as a reverberation chamber is anything but ideal, and often,
because of structural limitations, little can be done to improve the effectiveness
of the chamber other than to make minor corrections. The following principles of
reverberation chamber design are given for guidance in properly evaluating the good
and bad characteristics of a given chamber and in making such changes as will
improve the effectiveness of the chamber as much as possible.
SIZE
As the reverberation time increases as the size of the chamber increases, the
chamber should be as large as possible. Experience has shown that practically the
only exceptions to this rule are when the shape of the chamber may be improved by
reducing its size or when the tone opening cannot be made large enough in proportion
to the size of the chamber. For best musical results the chamber should be at least
800 cubic feet in volume. The dimensions of the chamber are in most cases ideal if
they are in the ratio of approximately 2 : 3 : 4 ½. A chamber of equal volume but
more cubical in form would have a longer reverberation time, while a chamber of less
cubical form would have a shorter reverberation time; however, dimensions in the
above ratio usually are most desirable. Chambers of complex shape or chambers of
regular shape whose greatest dimension is more than three times the least dimension
should be avoided.
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