Electro-Voice C4.2 EVID Ceiling Speaker Systems Instruction Manual

Electro-Voice C4.2 EVID Ceiling Speaker Systems

Product Information

Specifications

• EVID C4.2
• EVIDC4.2LP
• EVIDC6.2
• EVID C8.2
• EVID C8.2LP
• EVID C8.2HC
• EVID C10.1

Installation Manual
https://manual-hub.com/

Safety

• Caution! The seismic tab (auxiliary support ring) is not intended for primary suspension of the loudspeaker. The seismic tab should only be used as a secondary safety point.
• Caution! Ceiling mount speaker’s safety cable should be installed with 1-3 inches (25.4-76.2 mm) of slack.
• Notice!
  ATTENTION: UL SAFETY LISTING All EVID ceiling speaker models are listed under UL standard UL1480A as a signaling speaker. All models are also suitable for use in air handling spaces per UL2043.

Notices

• Old electrical and electronic appliances : Electrical or electronic devices that are no longer serviceable must be collected separately and sent for environmentally compatible recycling (in accordance with the European Waste Electrical and Electronic Equipment Directive). To dispose of old electrical or electronic devices, you should use the return and collection systems put in place in the country concerned.
• Copyright and disclaimer: All rights reserved. No part of this document may be reproduced or transmitted in any form by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher. For information on getting permission for reprints and excerpts, contact Bosch Security Systems, Inc. All content including specifications, data, and illustrations in this manual are subject to change without prior notice.

Welcome
Thank you for purchasing EVID Ceiling Series loudspeakers. Read through this manual to familiarize yourself with features, applications, and precautions before you use these products.

System Overview

Model Summary

• EVID C4.2: Perfect for conventional rooms. It has excellent bandwidth in an esthetically very unobtrusive installation profile. Its compact design fits in tight areas. Its 4-inch woofer and wave guide coupled, titanium-coated dome tweeter give smooth, wide frequency response. The enclosure is ported and tuned to provide  surprising bass response in such a compact package. Features an easy 3-point mounting system for quick installations.
• EVID-C4.2LP : The C4.2LP is the same as the C4.2 but in a low-profile installation package, ideal for tight ceiling spaces. It’s 3.7 deep to fit the tightest spaces, and shares the same outside diameter as the C6.2, C8.2, and C8.2LP speakers, so it can be used in combination with any of these models without any visual differences.

Product Usage Instructions

Installation

1. Ensure that you have read and understood the safety instructions provided in the manual.
2. Choose the appropriate EVID Ceiling Speaker model based on your room requirements.
3. Prepare the ceiling for installation, ensuring that it is structurally sound and capable of supporting the speaker’s weight.
4. Determine the optimal location for the speaker and mark the mounting points on the ceiling.
5. Install the mounting brackets or hardware according to the instructions provided.
6. Connect the speaker wires to the appropriate terminals on the speaker and secure them tightly.
7.  Attach the speaker to the mounting brackets or hardware, ensuring a secure fit.
8. Adjust the speaker angle if necessary to optimize sound projection.
9. Test the speaker to ensure proper functionality before finalizing the installation.

Usage

1. Power on the audio system or amplifier connected to the EVID Ceiling Speaker.
2. Adjust the volume and settings on the audio system to your desired levels.
3. Enjoy high-quality sound playback from your EVID Ceiling Speaker.

Maintenance

1. Regularly inspect the speaker for any signs of damage or wear.
2. Clean the speaker grille and enclosure using a soft, dry cloth to remove dust and debris.
3. Avoid using harsh chemicals or abrasive materials that may damage the speaker’s finish.
4.  If necessary, refer to the troubleshooting section of the manual for assistance with common issues.
5. Contact customer support or a professional technician for any repairs or servicing needs.

Disposal

1. Follow local regulations and guidelines for the disposal of electronic waste.
2. Do not dispose of the EVID Ceiling Speaker in regular household waste.
3. Use designated collection systems or recycling facilities to properly dispose of the product.

FAQ

1. Q: Can the EVID Ceiling Speaker be used in air handling spaces?
   A: Yes, all EVID ceiling speaker models are suitable for use in air handling spaces per UL2043.

2. Q: Is the safety cable installation important?
   A: Yes, the safety cable should be installed with 1-3 inches (25.4-76.2 mm) of slack to ensure proper support and prevent accidents.

3. Q: Can the EVID-C4.2LP be used with other models?
   A: Yes, the EVID-C4.2LP can be used in combination with the C6.2, C8.2, and C8.2LP speakers without any visual differences.

EVID Ceiling Speaker Systems

• EVID C4.2
• EVID‑C4.2LP
• EVID‑C6.2
• EVID C8.2
• EVID C8.2LP
• EVID C8.2HC
• EVID C10.1

Safety

• Caution!
  • The seismic tab (auxiliary support ring) is not intended for primary suspension of the loudspeaker. The seismic tab should only be used as a secondary safety point.
• Caution!
  • Ceiling mount speaker’s safety cable
  • The safety cable should be installed with 1-3 inches (25.4-76.2 mm) of slack.
• Notice!
  • ATTENTION: UL SAFETY LISTING
  • All EVID ceiling speaker models are listed under UL standard UL1480A as a signaling speaker. All models are also suitable for use in air handling spaces per UL2043.
• Notices
  • Old electrical and electronic appliances
  • Electrical or electronic devices that are no longer serviceable must be collected separately and sent for environmentally compatible recycling (in accordance with the European
  • Waste Electrical and Electronic Equipment Directive).
  • To dispose of old electrical or electronic devices, you should use the return and collection systems put in place in the country concerned.
• Copyright and disclaimer
  • All rights reserved. No part of this document may be reproduced or transmitted in any form by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher. For information on getting permission for reprints and excerpts, contact Bosch Security Systems, Inc.
  • All content including specifications, data, and illustrations in this manual are subject to change without prior notice.

Welcome

• Thank you for purchasing EVID Ceiling Series loudspeakers. Read through this manual to familiarize yourself with features, applications, and precautions before you use these products.
• EVID Ceiling Series loudspeakers use innovative design and materials to provide premium-level performance in a flush-mount ceiling format. Seven models comprise the EVID
• Ceiling Series : the C4.2 and the C4.2LP with a 4-inch LF driver and a 0.75-inch, titanium coated tweeter with waveguide; the C6.2 with a 6.5-inch LF driver and a 1-inch titanium-coated tweeter; the C8.2 and the C8.2LP with an 8-inch LF driver and a 1-inch titanium-coated tweeter; the C8.2HC with a fully waveguide loaded 8-inch LF driver and a 1-inch titanium coated tweeter; and the EVID C10.1, a true ceiling-mounted subwoofer designed to augment and extend the full-range model’s low-frequency response.

Important Features

• Matches acoustically to the EVID surface-mount speaker lines
• Model for model, has superior performance to competing brands
• Comes with both 70V/100V or 8-ohm operation standard on every model
• Includes all installation accessories commonly needed for most jobs

System overview

Model Summary

• EVID C4.2
  Perfect for conventional rooms. It has excellent bandwidth in an esthetically very unobtrusive installation profile. Its compact design fits in tight areas. Its 4-inch woofer and waveguide-coupled, titanium-coated dome tweeter give smooth, wide frequency response. The enclosure is ported and tuned to provide surprising bass response in such a compact package. Features an easy 3-point mounting system for quick installations.

• EVID-C4.2LP
  The C4.2LP is the same as the C4.2 but in a low-profile installation package, ideal for tight ceiling spaces. It’s 3.7” deep to fit the tightest spaces, and shares the same outside diameter as the C6.2, C8.2, and C8.2LP speakers, so it can be used in combination with any of these models without any visual differences.

• EVID-C6.2
  The C6.2 has a specially tuned enclosure and 6.5-inch woofer to provide amazing bass response. The 1-inch tweeter gives smooth controlled coverage out to 20 kHz. Perfect for installations where a flush-mount design is desired but demand for high-quality audio exists. Features a 4-point mounting system to make installations fast and easy.

• EVID C8.2
  The C8.2 has a specially tuned enclosure and 8-inch woofer to provide amazing bass response. The 1-inch waveguide-coupled tweeter gives smooth controlled coverage out to 20 kHz. Perfect for installations where a flush-mount design is desired but demand for high-quality audio exists. Features a 4-point mounting system to make installations fast and easy.

• EVID C8.2LP
  The C8.2LP is the same as the C8.2 but in a low-profile installation package. Ideal for tight ceiling spaces.

• EVID C8.2HC
  The EVID C8.2HC is ideal for high ceilings and reverberant “problem” rooms. Its exclusive ported, waveguide-coupled, 8-inch driver provides excellent intelligibility and definition. The 8.2HC’s patent pending design provides great coverage control throughout the voice range and above. No other ceiling speaker system provides the combination of excellent pattern control, wide bandwidth, high power handling, and compact design like the C8.2HC.

• EVID C10.1
  The C10.1 packs a 10-inch subwoofer in a tuned high performance enclosure to give amazing low frequency performance down to 45 Hz! It is one of the few quick-mount ceiling TRUE subwoofers available. Flexible installation and powerful low-end performance make it the ideal mate to any EVID ceiling model.

Packing list

Product Feature Identification

EVID C4.2, EVID-C6.2, EVID C8.2, EVID C8.2LP, EVID C8.2HC, and EVID C10.1 models

EVID Ceiling Series Systems (sold in pairs)

tweeter
EVID C10.1| 10″ High performance subwoofer

EVID Series Ceiling Mount Speaker Accessories

of 4)
RR-82| Rough-in plate for new construction involving the EVID-C4.2LP, EVID-C6.2, C8.2, and C8.2LP (package of 4)
RR-810| Rough-in plate for new construction involving the EVID C8.2HC and C10.1 (package of 4)
RPK-42| Rough-in package for new construction involving the C4.2 speaker only (package of 2)
RPK-82| Rough-in package for new construction involving the EVID-C4.2LP, EVID-C6.2, C8.2, and C8.2LP speaker only (package of 2)
RPK-810-B| Rough-in package for new construction involving the C8.2HC and C10.1 speaker only (package of 2)

NOTE : All products are not available in all regions.

Installation and Wiring

• The EVID mounting system has been designed so that, if necessary, the installation can be done from beneath the ceiling. In some cases with a suspended ceiling grid, however, it may be easier to access from both the top and bottom of the ceiling tile during the installation process. Typical installation hardware needed for either suspended ceilings or sheetrock ceilings is included. The ceiling speaker assembly is held in place by mounting tabs that securely grip the ceiling material. Input wiring is attached to a removable terminal block connector that can be prewired if necessary before speaker installation to speed up the installation process.

• INSTALLATION NOTE: USE OF OPTIONAL ROUGH-IN ACCESSORIES

• For most installations, no additional hardware is needed. However, a two-step installation procedure that is sometimes used for installation into sheetrock ceilings can be made easier by the use of the optional RR and RPK series of rough-in accessories before the ceiling material is installed. The rough-in accessories provide a cutout guide when many holes are to be made in a production-line style installation and to ensure the speakers are positioned correctly as the holes are cut in the sheetrock. Depending on the requirements, two types of rough-in accessories are available.

• RR Series Mounting Plates

• RR series plates are made of flat sheet metal with holes to attach to the joists or trusses of a building structure. The holes are drilled for nails or screws at 16 inches (406 mm), 20 inches (508 mm) and 24 inches (610 mm) on-center. The installer can drill other holes as needed up to a maximum of 24-3/4 inches (630 mm) apart. The sheetrock installs over the plate and the plate provides a template for a blind cutout of the hole in the sheet rock. The ceiling material is generally cut with a router-type cutting tool, using the plate ring as a cutout guide.

• RPK Series Kits
  The RPK series rough-in kit contains a RR series plate with a standard 2 gang electrical box mounted on the top with an attached short length of flexible conduit which connects to the ceiling speaker conduit clamp on the speaker’s rear terminal cover. This accessory allows for rigid conduit to be run to the box on the rough-in plate before the speaker or any sheetrock is installed. After the sheetrock is installed the speaker can be wired up and mounted all from below the ceiling.

• INSTALLATION NOTE: CONTROLLING VIBRATION

• Because of their high performance, EVID ceiling loudspeakers can generate substantial vibration, which can cause buzzing in loose sections of the ceiling structure. Depending on the character of the ceiling tile and related components, dampening material may need to be used under the tile rails or the edges of the tiles to eliminate rattles.

• Step 1 — Cut the Hole
  For suspended tile or sheetrock ceilings, cut out the hole either by tracing the cardboard template or with a circular cutter set to the appropriate cutout size. If the wire has been pre-installed, pull the wiring through the cutout hole.

• Step 2 — Install C-Ring and/or Tile Rails
  All EVID speakers come packaged with two types of backing hardware: a C-ring and two tile rails. For suspended ceiling installations, insert the C-ring through the hole cut in the ceiling tile. Place the C-ring around the hole with the tabs located as shown in the illustration. Insert the tile rails through the cut hole in the ceiling tile. Snap the two rails into the two tabs in the C-ring and align the rails so that the ends extend OVER the T-channel grid on the side of the tile. Secure the rails onto the C-ring tabs by inserting a screw though each tab into the rail.

• INSTALLATION NOTE: TILE RAILS AND C-RING
  Each speaker comes with two tile rails which are designed to fit either standard 24-inch-wide or 600-mm-wide tiles. It is important to note that the tile rail pieces do not actually attach to the T-grid struts. The ends of the rails sit OVER the T-grid strut. Normally, the tile supports the rails. The tile rails are pre-punched at regular intervals with holes along their length. This allows the C-ring to be positioned at any point along the rail. If the tile comes out or falls apart, the ends of the support rails fall onto the T-grid, which prevents the speaker assembly from falling.

• Always use all included support hardware when installing into suspended ceiling tiles to make sure the installation is secure.

• For sheetrock ceiling installations, the C-ring should be used by itself to reinforce the ceiling material and to spread out the pressure from the speaker hold-down tabs. Guide the C-ring through the cut hole in the ceiling, and place it on the back side of the hole before inserting the speaker.

• Step 3 — Attach Wiring to the Terminal Connector
  Insert the bare end of wire into the appropriate connector terminals and screw down the hold-down screw until tight, using a small screwdriver.

• INSTALLATION NOTE: CONNECTOR

• WIRING GUIDELINES

• The input connector’s four terminals are numbered and marked on the connector. Pins 1 and 2 are positive (+); pins 3 and 4 are negative (-).

• Note : Pin 1 is connected to Pin 2 and Pin 3 is connected to Pin 4 inside the speaker. Pins 1 and 4 are used as daisy-chain connections to other loudspeakers.
  There are two possible layouts for wiring a group of speakers; wiring in parallel or Daisy-Chaining.

• Wiring in parallel
  Connect the wire pair of the subsequent speaker to pins 2 and 3. When one input connector is removed, subsequent speakers will remain connected.

• Daisy-Chaining
  Connect the wire pair of the subsequent speaker to pins 1 and 4. When one input connector is removed, subsequent speakers will also be disconnected .

• INSTALLATION NOTE: SUBWOOFER POLARITY

• When adding a subwoofer, be sure to observe the correct polarity. The C10.1 subwoofer has been designed for optimum performance when used with the C4.2 or C4.2LP. In order to maximize the low frequency output when used with the C6.2 , C8.2, C8.2LP or C8.2HC, the polarity of the C10.1 subwoofer should be reversed.

• Plugging in the connector
  When all wiring has been completed to the connector, plug the input connector (A) into the socket in the speaker’s terminal cup (B). Tighten all screws to eliminate vibration.

Reinstalling the terminal cover plate for the EVID-C4.2LP To reinstall the terminal cover plate, do the following

1. Thread the wire through the strain relief fitting on the terminal cover plate.
2. Guide the terminal cover plate (A) into the terminal cover latch (B).
3. Insert the terminal cover locking screw (C) into the terminal cover plate.
4. Tighten the terminal cover locking screw.
   Ensure the terminal cover plate is secure. Do not over tighten the terminal cover locking screw.

Step 4 — Secure the Cable to the Speaker
Fully loosen the horizontal screw (C) shown in Plugging in the connector, page 14, then the strain relief screws (D). Run the wires through the opening in the fitting and plug the input connector (A) into the speaker’s terminal block (B).
Then tighten the strain relief fitting as follows:

Plenum cable
If plenum cable is used, slide the wiring through the strain relief fitting on the terminal cover plate. Hold the strain relief fittings tight around the cable. Tighten the strain relief screws first, then the horizontal screw. In the cases of insulated speaker wire and plenum cable, it is often possible to provide acceptable strain relief force by simply tightening the strain relief screws onto the terminal cover plate.
Alternate conduit fitting
If the installation used flexible (BX) or rigid (EMT) conduit, an alternate conduit fitting can be used.
INSTALLATION NOTE: ALTERNATE CONDUIT FITTINGS
Some cases require alternate fittings, many of which are available through most electrical suppliers. Simply remove the existing fitting by unscrewing the two hold-down screws, exposing a 7/8-inch (22 mm) knockout hole. Then install the alternate fitting. Make sure to always use a listed fitting in accordance with your area’s building codes and regulations.

Step 5 — Mount the Speaker into the Ceiling
Push the speaker into the ceiling hole until the front baffle rim is flush with the ceiling. Tighten the mounting tabs by turning the screw clockwise until the speaker is secure. Please note that the first clockwise quarter-turn rotates the attachment tabs outward. The remaining turns tighten the tabs down onto the back of the ceiling surface.

INSTALLATION NOTE : MOUNTING TABS
For each attachment screw, first turn one half-turn counterclockwise to release the mounting tab from its guide.
Step 6 — Connect an Auxiliary Support Line
Note the support ring on the back of the speaker. The ring allows for connection to a independent and secure anchor point. Construction codes often require the use of this secondary support point.
Caution!

• Ceiling mount speaker’s safety cable

• The safety cable should be installed with 1-3 inches (25.4-76.2 mm) of slack.

• Step 7 — Adjust Tap Selector
  The tap selector switch is located on the front baffle. Adjust the speaker to the appropriate tap setting before installing the grille. In some 70V/100V constant voltage installations it is advisable to leave the grilles off if final speaker audio level balance adjustments are to be made later. After the levels are adjusted the grilles can then be installed.

• EVID C4.2, C4.2LP, C6.2, C8.2, and C8.2LP
  In addition to the 8-ohm setting, the power taps are 30 W, 15 W, 7.5 W, and 3.7 W at both 70.7V and 100V, with a 1.8 W tap for 70.7V only.

• EVID C8.2HC and C10.1
  In addition to the 8-ohm setting, the power taps are 60 W, 30 W, and 15 W at both 70.7V and 100V, with a 7.5 W tap for 70.7V only.

Step 8 — Attach the Grille

• INSTALLATION NOTE: GRILLE SAFETY FEATURE
• EVID grilles features a unique safety tether to prevent the grille from falling if the grille is removed or comes loose after installation.
• First, install the grille’s safety tether by pushing the grille fastener into the hole in the front of the baffle. Second, press the grille into place until the front of the grille is flush with the rim of the baffle. Make sure the grille is securely seated to prevent it from vibrating loose.
• If you need to remove the grille, the easiest way is to insert two bent paper clips or other pointed objects into holes in the grille, then apply slow even pressure to pull down on the grille until that section of the grille comes out slightly. Continue the same procedure around the perimeter of the grille, loosening a portion at a time until the grille is removed.

Troubleshooting

• Ensure the amplifier channel is being fed an input signal (preferably via a signal input indicator on the amplifier). ****
• Verify the amplifier channel’s volume is turned up. ****
• Connect the loudspeaker and cable, which had no output to another amplifier channel, ensuring an input signal is fed to the new amplifier channel. If you then get output, the problem was the amplifier channel. If not, then the problem is either the cable or the loudspeaker.

Loudspeaker cables(s)| Replace the cable(s) connecting the loudspeaker system and amplifier.
Questionable or intermittent output, such as crackling| Faulty connection| Ensure all cabling for proper connector contact. A bad connection can result in intermittent contact or dramatically increased resistance, which in turn can cause reduces output or noises unrelated to the signal.
Improper power tap setting| Verify the power tap setting under the loudspeaker grille is appropriate for the installation and amplifier chosen.
Constant noise such as buzzing, hissing, or humming| A faulty electronic device in the signal chain| Loudspeakers cannot generate these sounds by themselves; you may have a faulty electronic device in the signal chain.
Poor system grounding| Check and correct the system grounding, as required.
Poor low-frequency output| Out-of-polarity hookup between multiple loudspeakers| When two loudspeakers are hooked up out of polarity (out of phase), the low frequencies cancel each other out. Try reversing the polarity of one of the loudspeakers either by turning around a dual-banana plug at the amplifier or by reversing the tip/sleeve leads on the jack. Which ever condition results in greater low-frequency output is the in- polarity condition.

If these suggestions do not solve your problem, contact your nearest Electro- Voice dealer or Electro-Voice distributor.

Technical data

EVID C4.2 and EVID-C4.2LP

4 in (100 mm) high-compliance driver (weatherized cone)
HF transducer| 0.75 in (19 mm) Ti-coated dome| 0.75 in (19 mm) Ti-coated dome
Mounting system| Integrated 3-point toggle anchors| Integrated 4-point toggle anchors
Acoustic design| Ported cabinet, two-way design, internally damped, w/passive crossover
Cabinet construction| Steel enclosure and UL94V-0 rated baffle and bezel
Grille construction| Powder-coated steel
Color| White (paintable)
Cutout dimensions (diam.)| 7.1 in (180 mm)| 10.6 in (269 mm)
Dimensions (depth x diam.)| 6.9 in x 8.3 in (176 mm x 211 mm)| 3.7 in x 11.8 in (94 mm x 300 mm)
Net weight| 6 lb (2.7 kg)| 7.35 lb (3.32 kg)
Included accessories| Tile bridge, mounting ring
Safety agency ratings| UL 1480 Safe for use in air handling spaces per UL 2043

EVID-C6.2 and EVID C8.2

w/passive crossover
Cabinet construction| Steel enclosure and UL94V-0 rated baffle and bezel
Grille construction| Powder-coated steel
Color| White (paintable)
Cutout dimensions (diam.)| 10.6 in (269 mm)| 10.6 in (269 mm)
Dimensions (depth x diam.)| 7.0 in x 11.8 in (190 mm x 300 mm)| 10.0 in x 11.8 in (255 mm x 300 mm)
Net weight| 10 lb (4.5 kg)| 11 lb (5.0 kg)
Included accessories| Tile bridge, mounting ring
Safety agency ratings| UL 1480 Safe for use in air handling spaces per UL 2043

EVID C8.2LP and EVID C8.2HC

only)/15/30/60 W
LF transducer| 8 in (205 mm) high-compliance driver (weatherized cone)
HF transducer| 1 in (25 mm) Ti-coated dome
Mounting system| Integrated 4-point toggle anchors
Specification| EVID C8.2LP| EVID C8.2HC
---|---|---
Acoustic design| Ported cabinet, two-way design, internally damped, w/passive crossover| Ported cabinet, waveguide- coupled, two-way design, internally damped, w/passive crossover
Cabinet construction| Steel enclosure and UL94V-0 rated baffle and bezel
Grille construction| Powder-coated steel
Color| White (paintable)
Cutout dimensions (diam.)| 10.6 in (269 mm)| 12.6 in (320 mm)
Dimensions (depth x diam.)| 7.0 in x 11.8 in (190 mm x 300 mm)| 11.9 in x 13.8 in (303 mm x 351 mm)
Net weight| 11 lb (5.0 kg)| 13.2 lb (6.0 kg)
Included accessories| Tile bridge, mounting ring
Safety agency ratings:| UL 1480 Safe for use in air handling spaces per UL 2043

EVID C10.1

UL 2043

Appendices

• Appendix A — Painting the Speaker
• If the speaker is installed in an area where the interior design requires a color match, these speakers are simple to paint. The speakers can accommodate almost any type of latex or oil-based paint. The bezel/rim can be painted before installation or after mounting into the ceiling.
• Painting Process
  • Clean the rim and grille with mineral spirits or other light solvent. Do not use harsh solvents such as gasoline, kerosene, acetone, or other chemicals. If you use these cleaners you may permanently damage the enclosure. Also, don’t use abrasives products such as sandpaper or steel wool.
  • Either by rolling or spraying, apply two or more thin coats of paint. If you are spraying, hold the spray can at the angles shown in the illustration.
• If you are painting the grille also, you must first remove the internal grille cloth. Spray painting is strongly recommended. If the grille is rolled or brush painted, the grille may become clogged with paint and the sound quality will suffer. After the paint has dried, replace the internal grille cloth.
• If you wish to paint the speaker along with the ceiling after installation, insert a plastic or cardboard paint shield into the front of the speaker to mask the drivers and internal baffle, paint the speaker, and then remove the shield. Do not paint the steel back can.

Appendix B — System Design Guide

• Selecting and Positioning Ceiling Loudspeakers

• Several key criteria determine the type and quantity of ceiling speakers to employ in a job. Specific EVID Ceiling Series models accommodate each job, depending on how these criteria are specified.

  • Room size
  • Coverage density desired
  • Coverage angle specification of the speaker
  • Ceiling height
  • Audio program material being played

• 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 .

• 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.

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.

• Of course, the C4.2 is somewhat less sensitive than the 8-inch C8.2. The difference is – 5 dB. The C4.2 will also have slightly reduced low-frequency capabilities below 65 Hz.

• However, neither of these factors is a significant problem in many distributed systems. The C4.2 is conservatively rated to handle 80 watts of continuous power equal to or greater than most other brands of 8-inch units, so its continuous SPL output will be more than adequate. Moreover, its low-frequency output can easily be augmented with the addition of the C10.1 subwoofer. For these reasons, the C4.2 represents a great way for you to provide good audio coverage 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 dispersion. Very large live spaces such as gymnasiums, convention centers, shopping mall atriums, and the like all benefit from more controlled sound projection. In such installations, the EVID C8.2HC is the best choice. Its 75-degree coverage pattern above 1 kHz  provides more intelligibility in large, acoustically live spaces. It also has a high 93 dB 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 bandwidth 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 60 Hz. This is more than sufficient for most applications.

• Layout: How Many?
  The Coverage Diameter by Ceiling Height chart 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.

Tab. 7.1: Coverage Diameter by Ceiling Height

• Use of Subwoofers
  • The C10.1 subwoofer can add considerable low frequency performance to any EVID installation. 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 output. 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 subwoofers evenly throughout the room and a few feet from the wall or corners. The added loading of the walls will enhance the response in these larger areas.
• Bosch Sicherheitssysteme GmbH Robert-Bosch-Ring 5
• 85630 Grasbrunn
• Germany
  • www.boschsecurity.com
  • © Bosch Sicherheitssysteme GmbH, 2018
• Bosch Security Systems, Inc 12000 Portland Avenue South Burnsville MN 55337
• USA
  • www.electrovoice.com

References

• Manual-Hub.com - Free PDF manuals!
• Professional loudspeakers & mics | Electro-Voice
• Manual-Hub.com – Free PDF manuals!

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