Electro-Voice EVID Use of Subwoofers, Reverberant Rooms and High Ceilings, Layout How Many?

Appendix B — System Design Guide

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.

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.

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

EVID™ Ceiling Series Installation and Operation Manual 11