User Guide

Sound System Design Reference Manual
2. Determine the power allocation for each
loudspeaker.
2.3 Social Area System:
1. Suggest a stereo layout of loudspeakers that
will provide all patrons with satisfactory sound.
2. Determine power requirements and
distribution method.
3. Specify disco components that will produce a
level of 115 SPL dB in the middle of the dance floor.
3. Answers to Exercises:
3.1 Ballroom System:
1. Use the square array, with center-to-center
overlap. Reasons: results in easier zoning
requirements and fits the rectilinear design of the
room better. Designing for seated ear height (1
meter) results in 12 loudspeakers.
2. Use JBL 2155 coaxial loudspeakers. With
sensitivity of 102 dB and power rating of 150 watts, a
7-17
Figure 7-14. Ballroom system, signal flow diagram.