Community R2SUBZ Manual de usuario descargar pdf (Pagina 22)

Community R-Series Application Guide — Page 16

DISCUSSION

Community does not recommend a split cluster system of this design because it is very difficult to avoid artificial echoes. Some-

times, however, it’s just not possible to cover an entire ball park from a single loudspeaker location and there aren’t

enough loudspeaker locations to allow a proper distributed system design.

In this case, a split-cluster design may be the only solution. The problem with this design is the artificial echoes that will

be created in most locations. Any listener that is 35 to 70 feet (11m-21m) farther from one cluster than the other will

hear an echo. For example, consider a listener at Point A. Typically, this listener might be 50 feet (15m) from the left

cluster and 200 feet (60m) from the right cluster. Since sound travels 1100 feet per second (335m/sec), the listener at

Point A hears the sound from the right cluster 136 msec after he hears the sound from the left cluster. This long delay

will produce a distinct echo, even if the sound from the right cluster is as much as 10 dB lower in level than the sound

from the left cluster.

A listener at Point A will hear an echo

from the right-hand cluster.

Colors show sound level variation in audience

areas. Field, press box and other areas will

also receive sound (not shown).

BASEBALL FIELD #3

SPLIT POINT-SOURCE SYSTEM ON

TWO LIGHT POLES

R2 for long-throw coverage.

R1 for mid-throw

coverage.

This image is

correct for the

right-hand

pole. Use a

mirror-image

cluster for the

left-hand pole.

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Community R2SUBZ Manual de usuario Pagina 22