Digital Sound & Music: Concepts, Applications, & Science, Chapter 1, last updated 6/25/2013
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Figure 1.45 Touch device control surface app
1.5.2.13 Loudspeakers
If you plan to work in sound for the theatre, then you'll also need some knowledge of
loudspeakers. While the monitors we described in Section 1.5.2.8 are appropriate for studio
work where you are often sitting very close, these aren't appropriate for distributing sound over
long distances in a controlled way. For that you need loudspeakers which are specifically
designed to maintain a controlled dispersion pattern and frequency response when radiating
over long distances. These can include constant directivity horns and rugged cabinets with
integrated rigging points for overhead suspension. Figure 1.46 shows an example of a popular
loudspeaker for live performance.
These loudspeakers also require large power amplifiers. Most loudspeakers are specified
with a sensitivity that defines how many dBSPL the loudspeaker can generate one meter away
with only one watt of power. Using this specification along with the specification for the
maximum power handling of the loudspeaker, you can figure out what kind of power amplifiers
are needed to drive the loudspeakers, and how loud the loudspeakers can get. The process for
aiming and calculating performance for loudspeakers is described in Chapters 4 and 8.
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