Niles OS-25 Mode d'emploi

MODEL

OS-25

MODEL

OS-25

Indoor/Outdoor Loudspeaker.

BLENDING HIGH FIDELITY

AND ARCHITECTURE®

INSTALLATION & OPERATION GUIDE

Niles Audio

Corporation

12331 S.W. 130 Street

Miami, Florida 33186

Tel: (305) 238-4373

Printed in Taiwan

INTRODUCTION

The OS-25 marries unparalleled listening satisfaction with the freedom to listen

to music anywhere! You can use them indoors and outdoors (even on a boat).

The extraordinary sonic performance of the OS-25 was achieved by harmoniz-

ing unique and proprietary technology with the most advanced manufacturing

methods and materials available.

The OS-25 is a two-way speaker in an acoustic suspension enclosure. The cab-

inet is shaped to fit neatly into corners or eaves. It is supplied with a swiveling

mounting bracket for easy installation anywhere. In addition, our engineers

constructed the OS-25's to withstand the stresses and strains of the world out-

side! For the first time, serious listeners can enjoy a concert on the green in

their own back yard.

INTRODUCTION

CONGRATULATIONS

Thank you for choosing the OS-25 Indoor/Outdoor Loudspeaker from Niles.

With proper installation and operation, you'll enjoy years of trouble-free use.

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

without notice. 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. OmniMount is a registered trade-

mark of OmniMount Systems.

TABLE OF CONTENTS

INTRODUCTION 2

FEATURES & BENEFITS 3

PARTS GUIDE 6

INSTALLATION CONSIDERATIONS 7

PAINTING THE OS-25 12

INSTALLATION 15

OPERATION 18

SPECIFICATIONS 19

WARRANTY REGISTRATION CARD 21

LIMITED WARRANTY 22

Low Diffraction MicroPerf™Aluminum Grille and Front Baffle

The aluminum MicroPerf™grille of the OS-25 has hundreds of precisely sized

perforations, creating an acoustically transparent grille. The aluminum construc-

tion resists oxidation enabling years of trouble-free operation in the harshest

conditions. The front baffle is gently curved in a radius optimized for the best

sound. Sound waves emanating from the woofer and the tweeter are not reflected

by the surrounding parts of the speaker.

Tapering Shape

The cabinet of the OS-25 is shaped so that the speaker will tuck discretely

away into corners or under eaves.

Swiveling Bracket

The U-shaped bracket and bracket knobs allow the OS-25 to be pointed at the

optimum listening position and locked into place quickly and easily.

Easy Three-Way Mounting System

1. The OS-25 can be hung from a nail using the nail hole on the bracket.

2. The bracket can be screwed into the mounting surface using your hardware.

3. The OS-25 is equipped with 1/4-20 threaded inserts for OmniMount®or

custom brackets.

Stable Shelf Placement

The bracket knobs serve as one of the speaker's feet when the OS-25 is placed

directly on a shelf or desktop without the bracket. In addition, two feet are

molded into the base of the cabinet to give added stability.

FEATURES & BENEFITS

Precision Crossover

An electronic dividing network inside the cabinet precisely distributes the

music to the woofer and the tweeter. The two-way design of the OS-25’s

crossover provides excellent stereo imaging and low distortion.

1” Teteron Tweeter

In the past, every weather-resistant speaker has disappointed listeners with a

fatiguing and harsh treble sound caused by tweeter ringing. The OS-25’s 1”

Teteron tweeter utilizes a tri-laminate design consisting of an inner textile

layer which forms the dome, a high damping layer to kill unwanted reso-

nances, and an outside layer of urethane to add stiffness and prevent breakup

modes. The result is a transparently clear, sweet, natural sounding tweeter

which still maintains extended frequency response.

6-1/2” Injection Molded TCC Woofer

The unusually stiff and light injection molded TCC cone, the butyl rubber sur-

round, the substantial magnet, and the rigid steel basket are all optimized for large

excursions of the woofer. In this way, the 6-1/2” woofer can create the same deep

bass output of a much larger speaker moving small distances in and out. The end

result is rich satisfying bass from a compact, weather-resistant loudspeaker.

Rigid, Acoustically Inert Enclosure

The cabinet of the OS-25 is composed of mineral filled polypropylene. This

material is extremely non-resonant. All you hear is the music.

FEATURES & BENEFITS

PARTS GUIDE

Incorporating a Volume Control

It’s possible to control the volume of the sound at the speaker location. Plan to

wire the system so that each pair of speakers has it’s own volume control. Niles

makes a wide range of indoor and outdoor volume controls. Consult your local

Niles dealer for more information. Volume controls are connected in line with

the speaker, so you must connect the wire from the amplifier to the volume con-

trol and then from the volume control to the speaker (See Figure 3).

Recommended Amplifier Power

We recommend an amplifier with a power rating of five to one hundred fifty

watts per channel for optimum performance. Ironically, most speakers are not

damaged by large amplifiers but by small amplifiers. If you are playing at high

volume, a small amplifier will run out of power very quickly. When an amplifi-

er runs out of power it creates damaging “clipping” distortion. A large amplifier

will play at the same volume without distorting. See the section "Operation"for

more information about clipping distortion.

INSTALLATION CONSIDERATIONS

Tools and Materials Required

• A wire stripper

• A pencil

• A level (optional)

• Three screws or bolts suitable for the mounting surface

• The proper screwdriver for your mounting hardware

• A drill bit of the right size and type

• An electric drill

Wiring

The OS-25 connects to your receiver or amplifier using 2-conductor speaker

wire (See Figure 2). For most applications, we recommend using 16 or 18

gauge wire. For wiring runs longer than 80 feet, we recommend 14 gauge wire.

The binding posts of the OS-25 will accommodate up to 12 gauge wire direct-

ly. Larger sizes can be accommodated using spade, banana, or pin connectors.

When you run wire inside walls, outdoors or in marine installations, special

jacketing or conduit is required for a trouble-free installation and conformation

to the local and national building codes. If you are not sure of the correct wire

jacket or type of conduit to use, consult a professional audio/video installer,

building contractor, or the local building and inspection department.

TECHTIP

WiresizeisexpressedbyitsAWG(AmericanWire

Gauge)number.Thelowerthenumber,thelarger

thewire,i.e.twelveAWGisphysicallylargerthan

fourteenAWG.

Placing the OS-25 for the Best Sound Quality

The OS-25’s dispersion pattern is very broad. The speaker is very sensitive and

will handle a lot of amplifier power. This allows good sound quality over an

extremely large listening area. However, if a single pair is positioned to provide

coverage of a very large room or patio, you will have “hot spots” of loud sound

when you are near the speakers. The best way to avoid hot spots for a large

space is to use several pairs. A good rule of thumb is a pair of speakers for

every 200 to 400 square feet of listening area. Your local Niles dealer is a good

source for advice on speaker placement for your particular installation.

When using more than one pair, it is usually best to alternate a left channel and

then a right channel, so that you never have a "left next to a left".

The position of the speakers and the surroundings around them play a very

important role in how a stereo image is created. You should experiment to find

the very best position for your speakers. Here are some guidelines to make the

process quick and easy.

5’ 10’

10’

Speaker

Placement

Zone

Speaker

Placement

Zone

Make sure you are not blocking or reflecting the sound 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 distance between the ideal listening

position and the wall you plan to mount the speakers on. Try to place the speak-

ers so that they are at least one-half the listening distance apart (this maintains a

large, pleasant stereo "image") and less than the entire listening distance (this

avoids a "hole-in-the-middle" effect). For example; if you are ten feet back from

the wall, the speakers should be between five and ten feet apart (See Figure 4).

You can control the speakers bass output by placement. This is called the

boundary effect. You will get more bass response by mounting the OS-25

directly to a wall or other flat surface (any boundary close to the speaker will

reinforce the bass frequencies). You can increase the bass output even more by

mounting the OS-25 in a corner or under an eave (See Figure 5) This type of

placement gives the speaker two boundaries, both reinforcing the bass sounds.

Of course, if you wish to hear less bass, try moving the speaker away from the

boundary (See Figure 6).

Mounting Methods

The OS-25 can be mounted either horizontally or vertically. The bracket knobs

will keep the speaker angled correctly in any position once they are tightened.

You can choose from three mounting methods to attach the OS-25 to the wall,

ceiling, or other mounting surface.

Figure5

Placement for more bass output Figure6

Placement for

less bass output

INSTALLATION CONSIDERATIONS

Figure4

Illustration depicts the opti-

mum placement zone for a lis-

tening distance of ten feet.

1. If the speaker is never going to be exposed to sudden accidental impacts,

wind, waves or earthquakes you can simply hang it on a nail using the nail

hole(s) of the bracket (See Figure 7).

2. The safest and most secure way to mount the speaker is by screwing it to the

mounting surface using your own hardware (suitable for the surface you are

mounting to) and the bracket supplied with the speaker (See Figure 7).

3. There are threaded brass inserts on the back of the OS-25 for attaching an

OmniMount or a custom bracket (See Figure 7). This allows you to position

the speaker at unusual angles or distances from the mounting surface.

Safety First!

Be careful to use hardware that is designed for the surface you are mounting to.

The OS-25 with the bracket weighs 9 pounds. If you are not sure ofa safe way to

mount the speakers, consult a professional installer or a building contractor.

You will maximize the useful life of the speaker, by placing the speaker so that

it receives less exposure to the elements. Look for the best overall compromise

between sound quality, convenience, and exposure. Do not compromise safety.

PAINTING THE OS-25

The enclosure, the brackets, and the grills of the OS-25 can all be painted to

match the surroundings. Because we want you to preserve the acoustic quali-

ties of the grille, please paint the grille according to the grille painting instruc-

tions. Make sure you pick a paint that is appropriate for the mounting location.

There are interior and exterior varieties, and even paint for marine uses. If you

are not sure what paint to use, consult a paint store professional or a painter.

Tools Required

• A spray can of primer paint (Krylon Sandable Spray Primer #1318)

• The correct paint for the surroundings (oil or water based paint is fine)

• A paint brush or applicator if the paint is not in a spray can.

• A paper clip or a corkscrew (for removing the grille)

• Masking tape

• 2 paint masks (supplied)

• A damp cloth and a dry cloth

Preparing to Paint

1. Separate the parts of the speaker. You should remove the brackets and the

bracket knobs. Remove the grille by hooking it with a bent paper clip or the

tip of a corkscrew and pulling it away from the cabinet (See Figure 8).

INSTALLATION CONSIDERATIONS

PAINTING THE OS-25

If you are using an applicator or brush and a can of paint, thin the paint first.

Thick paint will tend to clog the grille holes.

Replacing the Grille

Carefully fit the grille into its recess so that it is barely in place. Starting with

one corner, go around the speaker, pushing the grille in a little bit each time.

You should be gentle, the aluminum grille can be easily bent out of shape. You

will feel a positive “snap” when it is fully in place.

2. Wipe off the other sides of the cabinet, the bracket, bracket knobs, and grille

with a damp cloth. Do not touch or rub the speakers on the front baffle.

Make sure everything is dry before masking.

3. Mask off the binding posts and the brass threaded inserts on the back panel

with masking tape.

4. Mask off the threaded inserts on the top and bottom with masking tape.

5. Protect the front of the speakers by inserting the supplied paint masks in

place of the grills.

Painting the Cabinet, Bracket Knobs and Bracket

1. Apply two thin coats of a primer to the cabinet and knobs. We recommend

Krylon Sandable Spray Primer #1318.The bracket doesn't require a coat of primer.

2. Allow the primer to completely dry.

3. Apply the finish color.

4. Allow the paint to completely dry.

5. Carefully remove the masking material.

6. Do not reattach the speaker to the bracket e8 To the bracket es dmundted. TryTj0 -1.3684 TD0 Tw(wo tkee anl fhndalng mf the gfreshy raint d paits oo ta inuimum)Tj/F1 1 Tf-1.3258 04.1053 TD-0.0166 Tc0Painting the Crille

INSTALLATION

Mounting the Bracket

1. Remove the bracket knobs and the bracket from the speaker.

2. Hold the bracket up to the mounting surface. The speaker can be mounted

either horizontally or vertically. Hold the bracket so that the speaker wire

fits through the large, circular wire hole in the bracket. Align the bracket to

be square with the surroundings (use a level for accuracy).

3. Mark the locations of the three oval-shaped screw holes (See Figure 9). Be

sure to use all of the holes.

4. Drill pilot holes into the mounting surface.

5. Pull the speaker wire through the wire hole in the center of the mounting

bracket. Align the bracket so that the holes all line up.

6. Use your hardware to attach the bracket to the mounting surface.

Connecting the Speaker

1. Separate the two conductors of the speaker wire so that at least two inches

of each conductor are free.

2. Strip one half inch of insulation from the end of each conductor of the

speaker wire.

3. If you have any connectors (gold pins or bananas) which you prefer to use,

affix them to the stripped wire ends now. Only gold plated connectors

should be used outside as they will not tarnish or corrode.

4. Use the bracket knobs to attach the speaker to the bracket. Do not tight-

en the knobs completely.Angle the speaker so that the rear terminals are

accessible.

5. Connect one stripped wire end (or connector) to the black and one to the

red terminal. Pay attention to the markings on the wire. Each speaker must

be connected to the amplifier in the same way.

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 conve-

nience. There are different ways to mark the wire; 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 to avoid mistakes. If you do, one speaker will be playing

out of “phase” with the other speaker. An out-of-phase pair of speakers work

against each other and the sound of the two speakers playing together will be

lacking in bass and “phasey” sounding. If you suspect the sound is not right

and you cannot see any markings on the wire, try this simple test:

1. Point the speakers at each other, rather than at you.

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

INSTALLATION

Figure9

Mounting the

OS-25

3. Stand so you are the same distance from each speaker and listen to the rich-

ness of the bass and the loudness of the sound.

4. Turn off the amplifier and reverse the connections on one speaker 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”.

Final Adjustments

1. After checking that the speaker is in phase and works correctly, angle the

speaker for the best sound.

2. Tighten the bracket knobs using only your hands. Use of any power tools

may over-tighten the knob, and strip the threads of the insert.

3. Check that the entire installation is safe and secure.

OPERATION

Listening at Higher Volumes

Outdoors there are no walls to reflect and contain the sound. It requires more

power to achieve a reasonable volume of sound outside than it does when you

are indoors. You also frequently find yourself very far from the speaker. It is

possible 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 indoors or outdoors, turn the

volume down immediately! Those harsh sounds are masking some much more

powerful ultra-high-frequency sound spikes which will quickly damage any

fine loudspeaker.

Cleaning

You can clean the OS-25's 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. Hosing off the speaker is not recommended, as the tweeter is a precise

mechanism which might be damaged by a high pressure stream of water.

INSTALLATION

OPERATION

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