Niles Audio CM5PR User Manual

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Niles Audio

Corporation

12331 S.W. 130 Street

Miami, Florida 33186

Tel: (305) 238-4373

Fax: (305) 238-0185

Printed in Taiwan

© 2001 Niles Audio Corporation. All Rights Reserved. Niles, the Niles logo, and Blending High Fidelity and Architecture are registered trademarks of Niles Audio Corporation. MicroPerf is a trademark of Niles Audio Corporation. Kaladex is a registered trademark of DuPont Teijin Films. All other trademarks are the property of their respective owners. Because we constantly strive to improve our products, Niles reserves the right to change product specifications without notice. The technical and other information contained herein is not intended to set forth all technical and other specifications of Niles products. Additional information can be obtained on-line.Printed in Taiwan. DS00290ATW

I N S T A L L A T I O N & O P E R A T I O N G U I D E

M O D E L S

CM5PR

P E R FO R M A N C E

CM6PR

P E R FO R M A N C E

®

B L E N D I N GH I G HF I D E L I T Y

A N D A R C H I T E C T U R E®

Congratulations!

Thank you for choosing a Performance Ceiling Mount Loudspeaker from Niles. With proper installation and operation, you'll enjoy years of trouble-freeuse.

Niles manufactures the industry's most complete line of custom installation components and accessories for audio/video systems. For a free full line catalog write:

Niles, Catalog Request, P.O. Box 160818, Miami, Florida 33116-0818

TABLE OF CONTENTS

INTRODUCTION

2

 

 

FEATURES AND BENEFITS

2

 

 

INSTALLATION CONSIDERATIONS

4

 

 

SPEAKER PLACEMENT

6

 

 

INSTALLATION FUNDAMENTALS

9

 

 

INSTALLATION IN NEW CONSTRUCTION

13

 

 

INSTALLATION IN EXISTING CONSTRUCTION

14

 

 

FINAL INSTALLATION IN NEW OR EXISTING CONSTRUCTION

15

 

 

OPERATION

17

 

 

SPECIFICATIONS

18

 

 

WARRANTY REGISTRATION CARD

21

 

 

LIMITED WARRANTY

22

 

 

 

 

 

 

Limited Warranty

Niles Audio Corporation ("NILES") warrants its loudspeaker products to the original purchaser to be free of manufacturing defects in material and workmanship for a period of five years from date of purchase.

This Warranty is subject to the following additional conditions and limitations. The Warranty is void and inapplicable if NILES deems that the product has been used or handled other than in accordance with the instructions provided by the manufacturer, including but not limited to damage caused by accident, mishandling, improper installation, abuse, negligence, or normal wear and tear, or any defect caused by repair to the product by anyone other than NILES or an authorized NILES dealer.

To obtain warranty service, take the unit to the nearest authorized NILES dealer, who will test the product and if necessary, forward it to NILES for service. If there are no authorized NILES dealers in your area, you must write to NILES and include your name, address, model and serial number of your unit, along with a brief description of the problem. A factory Return Authorization Number will be sent to you. DO NOT RETURN ANY UNIT WITHOUT FIRST RECEIVING WRITTEN AUTHORIZATION AND SHIPPING INSTRUCTIONS FROM NILES.

If the above conditions are met, the purchaser's sole remedy shall be to return the product to NILES, in which case NILES will repair or replace, at its sole option, the defective product without charge for parts or labor. NILES will return a unit repaired or replaced under warranty by shipping same by its usual shipping method from the factory (only) at its expense within the United States of America. THERE ARE NO OTHER WARRANTIES, INCLUDING WITHOUT LIMITATION, EITHER EXPRESS OR IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, WITH RESPECT TO THE PRODUCT.

REPAIR OR REPLACEMENT AS PROVIDED UNDER THIS WARRANTY IS THE EXCLUSIVE REMEDY OF THE CONSUMER/PURCHASER. NILES SHALL NOT BE RESPONSIBLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES EXCEPT TO THE EXTENT PROVIDED (OR PROHIBITED) BY APPLICABLE LAW.

Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.

For the name of your nearest authorized NILES dealer contact:

NILES AUDIO CORPORATION

P.O. BOX 160818, Miami, Florida 33116-0818.

Please fill in your product information and retain for your records.

Model__________________________________________________________________________________

Serial No._________________________________________________________________________________

Purchase Date___________________________________________________________________________

Warranty Limited

22

WA R R A N T Y R E G I ST R AT I O N CA R D

Model Purchased_______________________________________________________________________________

Serial Number___________________________________________________________________________________

Date Purchased (month/day/year)________________________________________________________________

Dealer Name and Location_______________________________________________________________________

__________________________________________________________________________________________________

Dr.

Miss

Mr.

Mrs.

Ms.

Name___________________________________________________________________________________________

Address_________________________________________________________________________________________

_________________________________________________________________________________________________

City_________________________________________________________State______________Zip______________

Telephone (___________)___________________________________________________________________________

Please take a moment to fill out our warranty registration card. The information helps us to get to know you better and develop the products you want

Age:

Musical tastes:

Under 25

(Please check all that

25-34

apply)

35-44

Alternative

45-54

Classical

55 & over

Country

 

Income:

Jazz

New Age

 

Under $24,999

Popular

$25,000-$34,999

R&B

$35,000-$44,999

Rock

$45,000-$59,999

Other_____________

$60,000-$74,999

How did you hear

$75,000-$99,999

Over $99,999

about Niles?

Occupation:

Architect/Developer

Custom Installer

 

Arts/Entertainment

Direct Mail

Business Owner

Friend/Family

Engineer

In-StoreDisplay

Finance/Accounting

Interior Designer

General Office

Magazine Ad

Management

Mail-OrderCatalog

Professional

Newspaper Ad

Sales/Marketing

Product Brochure

Student

Product Review

Tradesperson

Retail Salesperson

What magazines do you read?

1.__________________

2.___________________

3.___________________

Who will install the product?

Custom Installer

Electrician

Friend

Myself

Do you . . . ?

Own a House. If yes, how many square feet?

__________________

Own a Town House/ Condominium/Co-op

Rent an Apartment

Rent a House

Are you interested in receiving literature on other Niles products?

Yes

No

Which factor(s) influ-

Are there products/

enced the purchase of

capabilities that you

your Niles product?

would like to see

(Please check all that

introduced?

____________________

apply)

Ease of Use

____________________

Price/Value

____________________

Product Features

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Quality/Durability

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Reputation

____________________

Style/Appearance

Warranty

 

DETACH HERE AND RETURN TO: Niles Audio Corporation Warranty Registration Dept. P.O. Box 160818 Miami, Florida33116-0818

Introduction

The PR or Performance group of ceiling mount loudspeakers offers speakers expressly designed for an optimum balance ofperformance and value. They employ highperformance components and materials that make them perfectly

suited as primary speakers in bedrooms, dens or living rooms, as main or surround speakers in home theaters. Each model features Niles’ patented two-piecenostrip speaker wire terminal which reduces installation time.

Features and Benefits

Talc-FilledPolyproylene Woofer with Butyl Rubber Surround

The CMPR Performance series loudspeakers employ a high performance woofer made of vacuum formed polypropylene with talc added for stiffening. The resulting cone offers low mass, good damping and superb musicality. Additionally, the woofer employs a Butyl Rubber Surround for improved midrange clarity as well as moisture resistance.

3/4" Fluid-CooledUltra-WideDispersion Kaladex® Tweeter in

Custom Pivoting Coaxial Enclosure

The PR Performance series Kaladex® Tweeter employs DuPont’s latest material technology to produce a dome tweeter with exceptional frequency response and low distortion. Highs are crystal clear and extended without the harshness often associated with polycarbonate designs.

The Kaladex® tweeter can pivot up to 20° within its mount. This allows for perfect alignment of the high frequencies and optimum performance without the diffraction distortion endemic to other speaker brands utilizing traditional pivoting tweeters.

No-StripSpeaker Terminal

Niles patented No-Stripterminal enables speakers to be connected without stripping the speaker wire.No-Stripterminals eliminate fumbling with wire strippers and input terminals. They are color coded and sim-

ply plug into the crossover circuit boards on the back of Niles speakers, resulting in positive in-phaseconnections every time.

Moisture, UV Resistant Construction

The CM5PR and CM6PR loudspeakers are suitable for use in high moisture environments. The drivers are resistant to moisture and UV exposure; the grille is made of powder-coatedaluminum. However, the speakers are not waterproof and direct contact with water should be avoided.

Engineered for Ceiling Placement

The CM5PR and CM6PR have been specifically designed and tuned for optimum performance when mounted in a ceiling. The custom designed low diffraction tweeter housing is mounted coaxially to avoid the “venetian blind” effect common with ceiling speakers that employ sub-bafflesas tweeter mounts. The 20° tweeter pivot angle ensures optimumhigh-frequencycoverage.

Installer Selectable Acoustic Fine Tuning

Installers can select to de-emphasizethe bass or treble by 2dB to accommodate reflective surfaces and corner loading. This selection is accomplished via bafflemounted controls that are accessible after the speaker has been installed.

contined on next page

Benefits and Features

2

Benefits and Features

MicroPerfGrilles

The CM5PR and CM6PR employ Niles exclusive MicroPerf grille construction. The exceptionally tight hole pattern provides acoustic transparency at all audio frequencies and enables the speaker elements to remain invisible. MicroPerf grilles can also be painted to blend seemlessly with the surrounding decor.

Easy Installation

The CM5PR and CM6PR employ a bracketless mounting system in existing ceilings. Simply cut a hole in the mounting surface, remove the grille from the speaker, connect the wires and place the speaker in the hole. Then tighten the four mounting “dogs” via the front panel screws. The dogs first swivel 90°, then clamp the speaker frame to the drywall as you tighten the screws.

4 or 8 ohm Selectable Impedance

The dual voice coil feature of the CM5PR and CM6PR gives the installer flexibility to select the speaker’s impedance — 4 ohms for systems where maximum current transfer and output level is desired; 8 ohms for systems utilizing multiple speaker pairs where amplifier loading is a consideration.

Hole Saving Bracket

Available as an optional accessory, CM5 Series and CM6 Series New Construction Brackets can be installed as a “hole-saver”before the drywall goes up. The drywall contractor cuts the holes as the drywall is installed, reducing installation time and minimizing the chance for lost wires.

PLEASE FILL OUT THE WARRANTY REGISTRATION CARD ON THE REVERSE SIDE, DETACH, AND MAIL TO:

Niles Audio Corporation

Warranty Registration Dept.

P.O. Box 160818

Miami, Florida 33116-0818

DETACH HERE

3

Installation Considerations

Recommended Amplifier Power

For satisfactory performance, we recommend an amplifier with a power rating of 10 to 100 watts for the CM5PR and 10 to 125 watts for the CM6PR. Curiously, most speakers are not damaged by large amplifiers but by small amplifiers. If your system is playing loudly, a small amplifier will

Figure 1

run out of power very quickly. When an amplifier runs out of power it creates damaging “clipping” distortion. A large amplifier will play at the same volume without distorting. See the section on operating the speakers for more information about clipping distortion.

The illustration shows how a typical CM loudspeaker mounts into a ceiling.

Dogs swivel 90°, then clamp the speaker frame to the drywall.

New Construction Bracket serves as a “hole saver” when drywall has not been applied. It is not necessary when retrofitting to existing ceilings.

Knockout wire tie allows the wire to be secured to the bracket throughout the new construction process. It knocks out cleanly when the speaker is installed.

New construction wings instantly snap into the bracket without screws.

Frames are molded with a slight texture to assure good paint adhesion.

Mounting screws tighten the “dogs”, clamping the speaker

to the drywall.

Rust-proofaluminum grilles make the CM series perfect for moist environments.

Wings are scored for easy size trimming.

Brackets and wings attach to the ceiling joists with nails or screws.

Figure 2

Figure 3

The CM5PR and

20° The CM5PR and

CM6PR include

CM6PR tweeter is

easy access, baffle

housed in a custom

mounted tone

designed, low

controls that enable

diffraction enclosure,

you to accommo-

pivots up to 20° to

date varying room

provide optimum

acoustics

high frequency

 

coverage

Considerations Installation

19

 

4

Considerations Installation

Incorporating a Local Volume Control

In a multiroom system there is one indispensible device for true convenience—alocal volume control. It enables you to adjust the volume of the speakers without leaving the room.

Plan to wire the system so that each pair of speakers has its own volume control built into the wall (think of a volume control as a dimmer switch for sound).

Niles makes a wide range of high performance indoor and outdoor volume controls. They are available in Standard or Decora® style cover plates (just like your light switches and dimmers). Volume controls are connected in line with the speaker, so you must connect the wire from the amplifier to the volume control and then from the volume control to the speaker.

Speaker Wire

Use 2-conductorspeaker wire when connecting CM5PR and CM6PR speakers to your receiver or amplifier. For most applications, we recommend you use 16 or 18 gauge stranded wire. For wiring runs longer than 80 feet we recommend 14 gauge stranded wire. Theno-stripterminals of the PR speakers will accommodate 12 to 18 gauge wire.

When you run wire inside walls, special jacketing (CL-2orCL-3)is required to both protect the wire and for fire prevention. In some areas conduit is required. For atrouble-freeinstallation, low voltage wire such as speaker wire must be run in accordance with the National Electrical Code and any applicable provisions of the local building code. If you are unsure of the correct installation techniques, wire jacket or type of conduit to use, consult a

TECH TIP

Wire size is expressed by its AWG (American Wire Gauge) number. The lower the number, the larger the wire, i.e. 12 AWG is physically larger than 14 AWG.

professional audio/video installer, your building contractor, or the local building and inspection department.

Incorporating Remote Control

If your stereo system operates with a wireless Infrared (IR) remote control, consider the advantages of installing a Niles Infrared Extender System. Niles manufactures a number of concealable IR sensors and wall mounted keypads which send a copy of your hand-heldremote command via a wire to your main equipment location, where it is repeated to your stereo system. The wire is typically installed with the speaker wire, since the speaker signal and the IR signal will not interfere with each other. This makes almost no difference to the installation time, and the cost of the recommended IR control cable (West Penn D291 or equivalent) is reasonable.

The correct routing for IR control cable is to home run an IR control cable from the main equipment location beside the speaker wire to the planned volume control location; and then on to the proposed sensor location. The combination of IR control cable and speaker wire enables a programmable Niles IntelliPad® to be installed at a later date (the IntelliPad has a convenient speaker mute feature in addition to automating and controlling your stereo system). An IR sensor is best placed where it is convenient for you to point thehand-heldremote. Both an IntelliPad and an IR sensor can be connected in one room with one home run IR control cable.

Insulation Behind The Speaker

For best performance from your speakers lay a batten of fiberglass insulation (example: R-19un-battedinsulation) on top of the speaker. Try to keep the same amount of insulation for each speaker, particularly in the same room, for consistent bass response.

Specifications

CM5PR

Driver Compliment

5-1/4"talc-filledpolypropylene woofer withbutyl-rubbersurround

3/4" fluid-cooledultra-widedispersion Kaladex® tweeter in a custom pivoting coaxial enclosure

Recommended Amplifier Power

10 to 100 watts per channel

Nominal Impedance

4 or 8 ohm selectable

Frequency Response

65Hz to 20kHz, +/- 3dB (on axis)

Tweeter Adjustment

Up to 20° pivot angle

Sensitivity

88dB for 2.83 volts of Pink Noise

Overall Exterior Frame Dimensions

8-1/8"diameter

Depth Behind Wall

3-3/8"deep (based on 1/2" drywall)

Wall Cut-OutDimensions

6-7/8"diameter

Wiring Requirements

We recommend 16 to 18 gauge stranded wire for up to 80 feet, 14 gauge stranded wire for up to two hundred feet.

Connectors accommodate 12 to 18 gauge stranded wire.

CM6PR

Driver Compliment

6-1/2"talc-filledpolypropylene woofer withbutyl-rubbersurround

3/4” fluid-cooledultra-widedispersion Kaladex® tweeter in a custom pivoting coaxial enclosure

Recommended Amplifier Power

10 to 125 watts per channel

Nominal Impedance

4 or 8 ohm selectable

Frequency Response

60Hz to 20kHz, +/- 3dB (on axis)

Tweeter Adjustment

Up to 20° pivot angle

Sensitivity

89dB for 2.83 volts of Pink Noise

Overall Exterior Frame Dimensions

9-1/4"diameter

Depth Behind Wall

3-3/4"deep (based on 1/2" drywall)

Wall Cut-OutDimensions

8" diameter

Wiring Requirements

We recommend 16 to 18 gauge stranded wire for up to 80 feet, 14 gauge stranded wire for up to two hundred feet.

Connectors accommodate 12 to 18 gauge stranded wire.

Specifications

5

 

18

Operations

Operation

Listening at Higher Volumes

It requires more power to achieve a reasonable volume of sound in a large room than it does in a small room. It is possible (even if you are not a teenager) to turn the volume so high that the amplifier runs out of power. This creates “clipping” distortion.

Clipping distortion makes treble sound very harsh and unmusical. When you hear harsh sounding treble from any good speaker, turn the volume down immediately! Those harsh sounds are masking some much more powerful ultra-high-fre-quency sound spikes which will quickly damage any fine loudspeaker. You are much less likely to damage a speaker with a large amplifier because it will be very loud indeed before it produces any clipping distortion.

Cleaning

You can clean the speaker with a dampened soft cloth or paper towel. If the speaker is mounted high up on a wall or ceiling, use a broom to gently brush it off.

Speaker Placement

Introduction

Although the CM5PR and CM6PR have extensive ability to compensate for unusual placements with their unique pivoting tweeters and acoustic fine-tuningswitches; placement is still the primary tool for satisfying your particular listening needs. In the following section, we discuss how speakers should be placed and how tweeters should be directed and how the acousticfine-tuningswitches should be set for different purposes.

Placement for Critical Listening

If you like to imagine that the band or orchestra is playing in front of you as you listen to music, or you are very conscious of clarity, detail and the textures of the individual instruments, or you listen critically to movie soundtracks or music videos in your home theater, you will need your speakers placed so that they are optimized for critical listening. Here are some guidelines to make the process of placement quick and easy.

Make sure the sound will not be blocked or reflected off of furniture or other objects. You should have a direct line of sight with the front of the speaker. To determine the best position, measure the “listening” distance between the ideal listening position (your favorite chair or couch) and the location in which you plan to install the speakers. Try to place the speakers so that they are equally distant from your listening spot and at least one half of the listening distance apart (this maintains a large pleasant stereo “image”). In home theater applications where there is a center channel you may choose to space the left and right main speakers farther apart for a “bigger than life” sound with Dolby® encoded movies and TV shows. However, for combined music and movie usage stay within thegood placement zone for music. For example; if you are ten feet back from the speakers, the speakers should be between five and ten feet apart(See Figure 4).

Tweeters should be directed at the listening position.

 

 

 

 

 

 

 

 

Figure 4

 

 

 

 

 

 

 

 

In this example,

 

 

 

 

 

 

 

 

the speakers

 

 

Direct tweeter

 

 

 

could be

 

 

 

 

 

placed from

 

 

towards listener

 

 

 

 

 

 

 

 

five to 10 feet

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

apart, since the

 

 

 

 

 

 

 

 

listener is 10

 

 

 

 

 

 

 

 

 

 

 

 

 

feet back from

 

 

 

 

 

 

 

 

the speakers

Critical

 

 

 

 

 

 

 

 

10'

 

5'

 

10'

 

Listening

 

 

 

Position

Direct tweeter towards listener

Placement Speaker

17

 

6

Placement Speaker

Placement for Varying Listening Positions

If you want the freedom to sit anywhere in a room facing any direction, and/or find that you prefer the “all around you” sound of some car stereos to a conventional “sound stage” facing you, consider the speaker placement techniques professional installers use in restaurants and bars. They place speakers in an array around the listening area, so that the music is always surrounding you, regardless of the direction you face.

The rule of thumb is to add one pair of speakers for every 100 to 200 square feet of listening area. Curiously, this is not so that you can play the music louder, but so that you can play it softer! When you have only one pair of speakers in a large room you will notice that when the sound is perfect in one part of the room, it is too loud near the speakers. By placing more than one pair in the room you will avoid these “hot spots” of loud sound and you will create more sonic ambiance while maintaining clarity and a rich sound everywhere (See Figure 5).

You can make listener position still less critical by using mono rather than stereo. This can be difficult to achieve with normal stereo amplifiers. However, Niles manufactures Systems Integration Amplifiers® which enable one room to be wired in stereo while other rooms are wired in mono! Consult your local Niles dealer for more information.

In smaller rooms or rooms that are infrequently used, you typically can’t justify the expense of more than two speakers. Try to bracket the room with the two speakers. Diagonal placement is a very effective way to stretch the coverage pattern of two speakers. You can also compromise between direct sound (for detail and clarity) and reflected sound (the ambi-

ent or “all around you” effect). The speakers can be placed near corners to create more reflected sound. By directing the tweeters to point away from the listener, so they create as much reflected sound as possible, you emphasize the ambient effect. The more reflected sound there is in the room the stronger the ambient effect at low volumes. You should use moderation, however, otherwise the compromise becomes too one sided and at high volumes, the sound will be blurred and less distinct.

Placement for Home Theater Rear Applications

In a home theater, the goal is to reproduce the experience of a great movie theater in our homes. The biggest difference between the two is the rear or surround speaker array in a commercial theater. Here, it is not uncommon to see twenty or thirty speakers around the audience. This huge array of speakers assures that you will feel completely surrounded by the ambient soundtrack of the movie. Film makers try to use the “surround” soundtrack to envelope you in the environment on screen. They will place background music, rain sounds, traffic noise, etc. on the “surround” soundtrack. In a home with a single pair of speakers it is easy for the jungle sounds to sound like they are “in the middle of your head” just like headphones!

A single pair of CM5PR or CM6PR Loudspeakers, properly placed, can create a very convincing simulation of an array of speakers. If you place them near a hard reflecting surface you can make one pair of speakers sound like several. Create as many reflections as possible by placing the speakers near a corner so that the adjoining walls will act as a powerful reflector. Direct the tweeters so that sound is pointed away form the listener creating

Figure 17

Tightening the mounting “dogs”

9.Setting the Bass and Treble cut switches. Listen to a well-recordedpiece of music at the user’s favorite listening position. a) Listen for bass boominess, particularly when the speaker is placed near a corner. Use the-2dBBass cut to correct. b) Listen for treble harshness or ringing, particularly when the speakers are placed in a room without carpet/ Use the-2dBTreble cut switch to correct.

10.Install the grille into the speaker. The grilles should fit snugly. If you have difficulty fitting them in, try loosening the mounting dog screws (excessive tightening can distort the shape of the frame holding the grille in place).

Painting the Speakers

All models may be painted. The plastic will readily accept most paints.

The speakers must be masked prior to painting them. The inside circular portion of the hole template can be used as a paint mask. Remove the outside portion of the template by gently pulling along the perforation. Affix the mask to the front of the speaker using a piece of tape. Fold the tape onto itself to form a double-sidedloop. Affix the tape to the tweeter and place the mask onto the speaker.

The grilles should be painted before they are installed. For all models, the best

results will be obtained by using a spray gun or airless sprayer, thinning the paint (prevents clogging of the grille holes), and by applying several light coats instead of one heavy one.

Speaker Phase

Speaker wire has two conductors. One conductor is attached to the negative (-)terminals and one conductor is attached to the positive (+) terminals of both your speaker and your amplifier. Usually, the wire is marked for your convenience. There are different ways wires are marked: a stripe on one wire, a ribbed area of one conductor you can only feel, different colors of metal wire on each conductor, or there might be a fabric strand or string wound into one of the conductors. Of course, there are some wires which appear completely identical. Be careful, or you might make a mistake.

If you make a mistake, one speaker will be playing “out-of-phase”with the other speaker. Anout-of-phasepair of speakers work against each other and the sound of the two speakers playing together will be lacking in bass and be “phasey” sounding. If you suspect the sound is not right and you cannot see any markings on the wire, try this simple test:

1.Stand half way between the speakers.

2.Play some music with the amplifier or radio set to Mono.

3.Listen to the richness of the bass and the loudness of the sound.

4.Turn off the amplifier and reverse the connections on one amplifier channel only.

5.Repeat the listening test with the same setting of the volume control. When the sound has a richer bass and is slightly louder the speakers are working together or “in-phase”.

Construction Existing or New in Installation Final

7

 

16

Construction Existing or New in Installation Final

Final Installation in New or Existing Construction

1.If it is possible to lay a batt of insulation into the ceiling cavity do so. Remember to use equal amounts of insulation for each speaker.

2.Check the position of the Impedance Jumper on the crossover PC board. Choose the 4 ohm position if you are using an amplifier capable of drawing a 4 ohm load and you have only one pair of speakers connected. Otherwise, use the 8 ohm position (See Figure 15).

3.Separate the speaker wire so that at least two inches of each conductor are free.

4.Open the no-stripterminal by applying pressure to the red and black levers until an audible “click” is heard.

5.Insert one unstripped wire fully into the black and one into the red terminal. Pay attention to the markings on the wire. Each speaker must be connected to the amplifier in the same way. If unsure, see “Speaker Phase” located on the following page. Squeeze the red and black levers until they click signifying that they have locked into the wire. Check to make sure that the knife assembly inside the no strip connector has properly pierced the wire (See Figure 16).

6.Insert the no strip terminal into the corresponding socket on the rear of the speaker. Push it down until it locks in place. The terminal will only fit in the socket in one direction. If the terminal does not properly seat, reverse the terminal

7.On both models, there are four clamps or mounting “dogs” which hold each speaker in place. The dogs are tightened via four front-bafflescrews. To install the speaker, first rotate the dogs inward. Insert the speaker into the cutout and tighten the dogs by turning the screws clockwise. DO NOT OVERTIGHTEN THESE SCREWS.Over-tight-ening the clamps may make the grille difficult to install.(See Figure 17).

NOTE: The screws will be easier to turn if you “prime” them first. Before installing each speaker, turn the screws in and then turn them back out to their original positions.

8.Direct the Tweeter. The tweeter is directed by gently pushing on the edge of the tweeter grille. It will move 20° in any direction. For critical listening point the tweeter to the user’s favorite listening position minimizing reflections from the side walls. For surround sound or low volume background listening create more reflections and thus more ambience by directing the tweeter towards the side walls. See Speaker Placement on Page 6.

still more reflections and thus more “surround sound” effect. However, as you move the speaker farther away from the listener, both the reflected and the direct sound will dissipate, requiring more power from your surround sound amplifier channels. If the surround sound system you are using has a small five or ten watt amplifier for the rear speakers, stay within five to eight feet of the listening location. If you are using a 25 to 50 watt amplifier you can mount the speakers 10 to 15 feet away from the listening location and still achieve reasonably high volume levels.

In large or unusually shaped rooms, using multiple speakers might be the only way to achieve a good effect. In large or unusually shaped rooms this might be the only way to achieve a good effect. If you like to listen to music surround modes which emulate concert hall acoustics, more than two surround speakers will prove extraordinarily effective (See Figure 6). With Niles CM5PR and CM6PR loudspeakers it is easy to add another pair without affecting the decor of the room. However, you will need to use a much more powerful

amplifier than that which is built into a typical surround sound receiver or amplifier. Niles makes a number of Systems Integration Amplifiers with proprietary features that make them uniquely suited to enhance a good surround sound system. Consult your local Niles dealer for more information.

The Boundary Effect

Corners can affect the bass response of the speaker powerfully! This is called the boundary effect. You will emphasize particular bass frequencies and cancel out other bass frequencies when you place speakers close to the wall/ceiling boundary or a corner wall boundary. This can make the speaker sound excessively boomy and inaccurate to some listeners, while to others it just seems like more bass sound. A good rule of thumb is if you always listen to your current pair of speakers with the bass turned up, you’ll enjoy corner placement. If you keep your tone controls at neutral, try to keep the speakers at least two or three feet from the boundaries of the room.

Placement Speaker

Figure 5

Figure 6

Varying Listening Position

Surround Sound

Figure 15 Setting the Impedance Jumper.

Figure 16 No-StripSpeaker Wire Terminal.

15

 

8

Fundamentals Installation

Installation

Fundamentals

Running the Speaker Wire in New Construction

If you have doubts about whether you are capable of installing a Niles ceiling mount loudspeakers, consult a Niles dealer or professional installer. They have special tools, techniques, and experience to make the impossible possible. The installer can provide you with an estimate before any work is done.

Scheduling and Preparation

Plan to schedule the speaker wiring after the electrical wiring is finished. That way you can avoid wire routes which could potentially induce hum over the speaker wire. The basic rules are:

Never run speaker wire through the same hole as an electrical cable.

Never run speaker wire into the same J-boxas electrical cable.

Avoid running the speaker wire beside the electrical cable. Keep your speaker cable at a distance of at least 18"-22"from any electrical power cable.

Figure 7

Side-by-sidewiring is unavoidable in particular spots in every house, just move the speaker wire route away as soon as possible. If construction forces a side by side run for more than ten feet, install metal conduit or shielded speaker wire. Lowvoltage wires such as doorbells, intercoms, telephone, security, or television cannot cause interference or hum on your speaker wires, so you can safely run all of them at the same time, through the same holes,side-by-side.

Before you drill any holes, mount the speaker brackets in the desired speaker locations and mount p-ringsor open backedJ-boxeswhere thein-wallvolume controls and stereo equipment will be.

Safety First!

Wear gloves, safety goggles and head protection when drilling. Avoid nails, they ruin bits and they can create injury. Pay particular care when using “hole-hogs”and other powerful electric drills; the torque of the drill when suddenly stopped by a nail can break the wrist of a strong man.

Drilling

Use a bit that is large enough for the wires you plan to run. An auger bit is the preferred bit for rough-inwiring. It will actually pull itself through the wood, so that the drill motor, not you, does most of the work. You may be drilling a lot of holes, so this is an important consideration.

Always drill the holes in the center of the stud. If you have to notch the stud or drill the hole closer than one inch from the edge of the stud, protect the wire with a nail plate (See Figure 7).

When drilling holes in ceiling joists drill in the center of the joists and try to locate the hole near the end of the joist. DO NOT drill through a “gluelam” or any load bearing beam without the direction of your contractor.

Installation in

Existing Construction

IMPORTANT: Before you cut into any wall, review the sections on running wire and speaker placement.

1.When determining the location of the speaker cutout keep in mind that the mounting dogs will extend 3/4" beyond the cutout. make sure that you do not place the edge of the cutout directly next to a ceiling joist. Locate the joists using a stud sensor or hand-knocking.

2.Once you have determined a possible position for the cutout, drill a 1/8” pilot hole just barely through the ceiling (1/2” to 5/8” deep in most homes) about an inch below the center of your proposed speaker location. BE VERY CAREFUL NOT TO DRILL THROUGH EXISTING WIRES, PIPES, OR STRUCTURE. IF YOU FEEL ANY EXTRA RESISTANCE AS YOU ARE DRILLING, STOP.

3.Cut a foot-longpiece of coat hanger. Bend the wire (creating a right angle) leaving4-1/8"at one end for the CM5PR and 4/3/4" for the CM6PR (this allows for the extra width of the mounting dogs). Poke the“L-shaped”wire into the pilot hole and turn it in a complete circle and move it into the ceiling cavity to make sure you have approximately3-3/4"of depth. If the wires movement is obstructed by anything, fill the hole(s) with spackle and try another location.(See Figure 14)

4.If the coat hanger moves freely in a complete circle, hold the supplied template up to the ceiling surface. Outline the circular cutout on the ceiling surface with a pencil. Drill starting point with a 1/4" bit.

Figure 14

5.If you are cutting drywall use a sheetrock or keyhole saw. Cut the hole with the saw at a 45° angle. That way, the drywall section can be replaced cleanly if there is an unseen obstruction behind the wall. BE VERY CAREFUL NOT TO SAW THROUGH EXISTING WIRES, PIPES, OR STRUCTURE. IF YOU FEEL EXTRA RESISTANCE AS YOU ARE CUTTING, STOP.

6.If you are cutting into a plaster ceiling, use masking tape to outline your penciled circle and use a razor to score the plaster down to the lath beneath. Then use a chisel to remove all of the plaster within the taped outline. To actually cut the lathe, two methods are used professionally; sawing with a metal cutting blade on a sabre saw is the quickest and the riskiest. Sawing a lathe with a sabre saw can easily vibrate plaster off the ceiling in a completely distant location creating more patchwork. If you have the patience, use a pair of tin snips to slowly nip away at the lath instead. There is little risk with this method, it is just time consuming.

Construction Existing in Installation

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