Appendix b — system design guide, Use of subwoofers, Reverberant rooms and high ceilings – Electro-Voice EVID User Manual
Page 13: Spl requirements: how loud, Layout: how many, Coverage diameter by ceiling height
age while maintaining a competitive edge in
price quotes in installations that do not need the
extended performance of the larger models.
Reverberant Rooms
and High Ceilings
Situations arise, however, in which controlled
coverage is more desirable than broad disper-
sion.Very large live spaces such as gymnasi-
ums, convention centers, shopping mall atri-
ums, and the like all benefit from more con-
trolled sound projection. In such installations,
the EVID 8.2HC is the best choice. Its 75-
degree coverage pattern above 1kHz provides
more intelligibility in large, acoustically live
spaces. It also has a high 93dB sensitivity rating
for optimum efficiency.
SPL Requirements: How Loud?
The EVID C8.2 is a great speaker to use when
higher SPL is required.The fidelity and band-
width of the unit is substantial and is ideal for
applications requiring high quality foreground
music reproduction.The C8.2 has substantial
low frequency energy down below 60Hz.This
is more than sufficient for most applications.
Layout: How Many?
The chart below shows the effective coverage
diameter of the EVID models assuming a 4-foot
listening plane height. Using these figures you
can lay out a coverage pattern for the job after
deciding the overlap criteria described earlier
on page 10.
Coverage Diameter by Ceiling Height
Model
8'
12'
20'
24'
C4.2
17'
34'
68'
85'
C8.2
11.5'
23'
45'
57'
C8.2HC 6.5'
12'
24'
30'
C10.1
180° coverage
Use of Subwoofers
The C10.1 subwoofer can add considerable
low-frequency performance to any EVID instal-
lation. It is important to note that the C10.1
subwoofer depends on the ceiling and walls to
properly load itself and to reinforce its bass out-
put. Correct positioning is important to get
maximum impact.
In smaller rooms when a single C10.1 is
used, a center or near-center position is best.
This gives the most even coverage. For larger
rooms where more than one C10.1 are
employed, the added effect of the room’s walls
can be used. In such a space, position the sub-
woofers evenly throughout the room and a few
feet from the wall or corners.The added load-
ing of the walls will enhance the response in
these larger areas.
11
EVID™ Ceiling Series Installation and Operation Manual
Appendix B — System Design Guide