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Design Guide: Band Training Facilities
DG-1110-3-119
General Design Programming
Figure 3-14. Ductwork Design to Reduce Sound
Transmission
should be long and devious (and acoustically lined). Typi-
cally trunk ducts run over corridors, with separate branch
ducts serving each room. Volume control dampers at the
terminals should be avoided; they are best located at
the branch duct takeoffs.
The mechanical equipment should be located far from
sensitive music rooms. It should be on grade, rather than
on rooftops or mezzanines, where adequate vibration iso-
lation is much more difficult to achieve (see Figure 3-14).
C. Room Acoustics
The quality of sound within the room, assuming that extrane-
ous sounds from other areas are eliminated or neutralized,
is the key factor in room acoustics. The room's size and
shape and the acoustical properties of its finishes must be
manipulated to form the desired environment--a place
where sounds are heard by band-members and leaders as
distinct yet blended, strong yet not too loud, and of such
quality that the players enjoy the sound they make. Three
problems must be solved within the space: 1. the con-
trol of sheer loudness and reverberation; 2. clarity and
communication; and 3. avoidance of unwanted effects.
1. Loudness and Reverberation. * Loudness depends on
the sound energy emitted by the instruments, which only
the players can control, and on the acoustic absorptivity
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