Owner's Manual
Table Of Contents
- Installation Manual
- Table of Contents
- 1 Safety
- 2 Welcome
- 3 System overview
- 4 Installation and Wiring
- 4.1 Step 1 — Cut the Hole
- 4.2 Step 2 — Install C-Ring and/or Tile Rails
- 4.3 Step 3 — Attach Wiring to the Terminal Connector
- 4.4 Step 4 — Secure the Cable to the Speaker
- 4.5 Step 5 — Mount the Speaker into the Ceiling
- 4.6 Step 6 — Connect an Auxiliary Support Line
- 4.7 Step 7 — Adjust Tap Selector
- 4.8 Step 8 — Attach the Grille
- 5 Troubleshooting
- 6 Technical data
- 7 Appendices
- Product Info
- Warranty
- Safety Notes
EVID Ceiling Speaker Systems Appendices | en 25
Electro-Voice Installation manual 2018.09 | 11 | F.01U.177.705
The information below, and the free design program downloadable from
www.electrovoice.com, will help you optimize your EVID design. In the traditional approach to
overhead distributed systems, loudspeakers are placed in a grid whose dimensions are
dictated by the room height and the directivity of the speaker elements. Two basic placement
patterns prevail: square spacing and hexagonal (or crisscross) spacing.
Grid Edge-to-edge Minimum
overlap
Center-to-
center
Hexagonal
Square
Figure7.2: Coverage patterns
In addition to the spacing pattern, the designer must choose between three coverage density
types, designated respectively as edge-to-edge, minimum overlap and center-to-center. The
greater the overlap, the more uniform the coverage. The , page 26 illustration shows these
various layout patterns.
7.2.2 Ceiling Systems: Size vs. Coverage
In the past, system designers usually specified 8-inch cone loudspeakers for distributed
overhead systems, at least in part because they represented the traditional choice. EVID
systems, however, allow for far more flexible options.
In many cases, you can achieve excellent results — at a significant savings — by using 4-inch
transducers. This is especially true in jobs that do not require extended low-end response or
high SPL levels. Four-inch transducers, such as those used in the C4.2, offer wider dispersion
to allow for fewer speakers to be employed in the job. For example, due to its smaller cone
diameter, the C4.2 exhibits significantly wider dispersion (130 degrees) than the C8.2 (110
degrees) at the -6 dB points.
The effect of this characteristic on an overhead system is indicated in the , page 26
illustration. In replacement applications where existing speaker positions are used, the C4.2
(shown in angle A) offers greater overlap and, thus, more uniform coverage than an older
conventional 8-inch unit (shown in angle B). When specifying a new system, you can take
advantage of the C4.2’s wider dispersion to decrease the number of speakers required to
cover a given area. This will result in even greater savings.