User Guide

Sound System Design Reference Manual
The system consists of a central array of left,
center, and right stereophonic music channels;
speech will be reinforced over the center channel
only. Delayed coverage for the balcony area will be
provided by a ring of seven flown loudspeakers, and
under-balcony coverage will be augmented by a ring
of fifteen soffit mounted loudspeakers. The main
array over the platform should be designed for
nominal horizontal coverage in excess of 120
degrees. If a CADP2 analysis shows they are
needed, side and front fill loudspeakers may be
added to increase coverage in those areas of the
main floor.
The main stereo array is intended to cover
primarily the main floor and first few rows under the
balcony. Coverage of the balcony area will be
essentially monophonic, with the same signal fed to
all of those loudspeakers.
The main stereo loudspeaker systems should
be capable of extended bandwidth at both low and
high frequencies. Music levels of 105 dB are
expected on the main floor.
2. Exercises:
2.1 Main Arrays:
1. Specify the elements in each of the three
main arrays and determine the power needed.
2.2 First Delay Ring:
1. Specify the elements needed, power
required, and distribution method.
2.3 Second Delay Ring:
1. Specify the elements needed, power
required, and distribution method.
3. Suggested Answers to Exercises:
3.1 Main Arrays.
There are two basic approaches in designing
the main arrays. A completely custom system may be
assembled with individually fabricated low and mid-
frequency enclosures. The benefit in this approach is
that the HF components can be kept tightly clustered
together with a minimum of interference among
them. However, the attendant costs of rigging may
make this approach unreasonably expensive.
7-10
Figure 7-8. Electrical diagram of the main array