I n s t a l l a t i o n G u i d e
IW2550LCR ■ IW2650LCR ■ IW2670LCR ■ IW2770LCR
Professional Quality, In-Wall, Enclosed
L e f t / C e n t e r / R i g h t C h a n n e l L o u d s p e a k e r s
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INTRODUCTION
StageFront Home Theater Solutions loudspeakers are expressly designed
for superior sonic quality in home theater applications. Each model employs
advanced technology components that extract the subtle nuances in recorded
music or the thunderous action sound in a movie. Models ending in “LCR” are
intended primarily for front channel left/center/right placement or wherever a
monopole design is required. Models that end in “FX” are designed for special
effect placement. StageFront models are the perfect choice wherever quality of
sound is the most important consideration.
IW2550LCR
Stock Number
IW2650LCR
Stock Number
FG01330
FG01329
W2670LCR
Stock Number
IW2770LCR
Stock Number
FG01327
FG01326
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1
FEATURES AND BENEFITS
DUAL TCC™ (TALC, CARBON, CERAMIC-FILLED) WOOFERS*
*IW2550LCR & IW2650LCR models only
Extremely rigid to reduce breakup, lower distortion and provide enhanced
bass response
DUAL INTERLACED CARBON-FIBER WOOFERS WITH BUTYL
RUBBER SURROUNDS*
*IW2670LCR & IW2770LCR models only
Provide increased sound pressure levels and sustained high-power output
FLUID-COOLED TETERON DOME MIDRANGES*
*IW2670LCR & IW2770LCR models only
Produce smooth detailed dialog
FLUID-COOLED TETERON DOME TWEETERS
Deliver ultra-wide dispersion and silky-smooth response
ADJUSTABLE, CAST ALUMINUM, FULLY-ENCLOSED,
DISPERSION-CONTROLLING MIDRANGE/TWEETER POD*
*IW2670LCR & IW2770LCR models only
Enables precise imaging regardless of placement and accommodates vertical or
horizontal installations
VARIABLE MIDRANGE AND TREBLE CONTROLS*
*IW2670LCR & IW2770LCR models only
Enables fine-tuning after installation (+/- 3dB)
CROSS-BRACED PORTED CABINETS WITH INTEGRATED FRAME DESIGN
Fit standard 2x4 construction and are easily retrofitted
EPOXY-COATED MICROPERF™ MAGNETIC GRILLE
Provides an elegant yet unobtrusive appearance
DOLBY DIGITAL® READY
StageFront Home Theater Solutions loudspeakers are expressly designed
for superior sonic quality in home theater applications. All models exceed the
specifications set forth by Dolby Laboratories for the accurate reproduction of
Dolby Digital-Encoded Sources
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2
INSTALLATION CONSIDERATIONS
Loudspeaker Baffle
Dogs swivel 90°
Mounting Screws
Grille
Figure 1. Mounting an IW2770LCR vertically into a wall.
TOOLS AND PRECAUTIONS
We recommend using the following tools to install an In-Wall StageFront
loudspeaker:
■ Electric drill with 1/4- and 1/2-inch drill bits, and a 1-inch flat drill bit (for drilling
through studs)
■ Keyhole or drywall saw
■ Stiff wire, fish tape, or glow rods (for routing cables)
(CONTINUED ON NEXT PAGE)
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3
INSTALLATION CONSIDERATIONS (CONTINUED)
■ Phillips screwdriver set
■ Cable ties
■ Pencil
■ Level
■ Rubber gloves and protective eyewear
Before starting the installation, please observe the following precautions:
■ Turn off all system power before making any connections
■ Always wear protective eyewear when using tools
■ Make sure hands are clean before installation
■ Wear gloves when working with fiberglass insulation
RECOMMENDED AMPLIFIER POWER
For satisfactory performance, we recommend using an amplifier with a power
rating of 15 to 125 watts. Most loudspeakers are not damaged by large amplifiers,
but rather by small amplifiers. If your system is playing loud music, a small
amplifier will run out of power very quickly and can create damaging “clipping”
distortions. A more powerful amplifier will play at the same volume without
distorting. See OPERATION on page 11 for more information about amplifier
clipping distortion.
LOUDSPEAKER WIRE
Use 2-conductor loudspeaker wire when connecting loudspeakers to your
receiver or amplifier. For most applications, we recommend using 16-gauge wire.
For wiring runs longer than 80 feet, we recommend 14-gauge wire. The spring-
loaded terminals will accommodate up to 12-gauge wire directly. Larger sizes can
be accommodated via pin connectors. When running wire inside walls or ceilings,
use special jacketed cable (CL-2 or CL-3) to protect the wire and to meet local
electrical and fire codes. In some areas, conduit is also required. For a trouble-free
installation, low-voltage wire such as loudspeaker 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 professional audio/video installer, building
contractor, or the local building and inspection department.
TECH TIP
Wire size is expressed by its AWG (American Wire Gauge)
number – the lower the number, the larger the wire. For
example, 12 AWG is physically larger than 14 AWG.
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4
LOUDSPEAKER PLACEMENT
NOTE: THE STAGEFRONT LCR LOUDSPEAKERS ARE DESIGNED FOR USE IN FRONT LEFT, CENTER
OR RIGHT-CHANNEL APPLICATIONS. FOR EFFECT CHANNEL NEEDS, WE RECOMMEND USING A
STAGEFRONT FX LOUDSPEAKER.
PLACING THE STAGEFRONT LCR AS THE FRONT LEFT AND
RIGHT LOUDSPEAKERS
In a home theater, the intelligibility of dialog and action reproduced by the front
loudspeakers is paramount! The position of each loudspeaker plays a very
important role in how clear the sound is and how a stereo image is created. Here
are some guidelines to make the process of placement quick and easy:
■ Make sure the sound will not be blocked or reflected off furniture or other objects.
The listener should have a direct line of sight with the front of the loudspeaker. To
determine the best position, measure the “listening” distance between the ideal
listening position (e.g., favorite chair or couch) and the wall in which you plan to
install the loudspeakers.
■ For stereo music applications, try to place the loudspeakers so that they are equally
distant from the listening spot and at least one half of the listening distance apart to
maintain 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 loudspeakers farther apart for a “bigger than life” sound
with Dolby® encoded movies and TV shows. However, for combined music and movie
usage, we recommend using the placement zone for stereo music. Ideally, if the
listening position is 10 feet back from the wall, place the loudspeakers between 5
and 10 feet apart, as shown in Figure 2.
Loudspeaker
Placement
Zone
Critical
5'
10'
10'
Listening
Position
Plasma TV
Figure 2. Recommended
loudspeaker placement for
front left and right channels.
Loudspeaker
Placement
Zone
(CONTINUED ON NEXT PAGE)
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5
INSTALLATION CONSIDERATIONS (CONTINUED)
As for placement height, place front left and right loudspeakers on either side of the
picture source so that their tweeters are not more than 24 inches above or below
the center-channel loudspeaker’s tweeter (see Figure 3 on page 7).
If the StageFront LCR loudspeaker is being installed in existing construction, please
use the included cardboard template to mark your installation location. Check for
proper clearance within studs or any other obstructions before cutting the speaker
opening. If you are unsure of the correct installation techniques, please consult your
authorized Niles Audio dealer.
NOTE: DO NOT PLACE ANY STAGEFRONT LCR OR FX LOUDSPEAKERS TOO CLOSE TO A DIRECT-VIEW
CRT TV MONITOR, AS IT MAY CAUSE PICTURE DISCOLORATION. IN GENERAL, TRY TO KEEP IT AT
LEAST 24 INCHES AWAY FROM THE TV. WITH LARGER CRT SCREEN SIZES, TEST THE PLACEMENT
DISTANCE FOR PICTURE DEGRADATION BEFORE INSTALLATION.
THE BOUNDARY EFFECT
Placing a loudspeaker in a corner can powerfully affect the way a listener
perceives bass response. Known as the boundary effect, placing loudspeakers
close to a wall/ceiling boundary or near a corner wall boundary will emphasize
certain bass frequencies, while canceling others. This effect can make the
loudspeaker sound excessively boomy and inaccurate to some listeners, while to
others it just seems like more bass sound.
As a good rule-of-thumb, if you like listening to your current pair of loudspeakers
with the bass turned up, you’ll enjoy corner placement. However, if you listen with
the tone controls at neutral, try keeping the loudspeakers at least 2 or 3 feet from
the boundaries of the room.
PLACING THE STAGEFRONT LCR AS THE CENTER-CHANNEL LOUDSPEAKER
The center-channel loudspeaker is the workhorse in a home theater system.
It handles all of the critical dialog and is vitally important in creating the illusion
of sounds emanating directly from the picture. Here are some tips for obtaining
optimum center-channel performance:
■ In a typical installation, place the loudspeaker horizontally, directly above or below
the television or projection screen. Try to ensure that the loudspeaker is not placed
too high relative to the left and right loudspeaker, as shown in Figure 3.
■ The IW2670LCR and IW2770LCR feature a midrange/tweeter pod that can be
rotated to accommodate horizontal installations. If you mount one of these models
horizontally, please remove the screws that hold this pod in place, rotate the pod
ninety degrees so that the tweeter is above the midrange and reinstall the screws to
reattach the pod to the loudspeaker as shown in Figure 4.
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6
IW2770LCR
(Optional Placement Above TV)
Pod rotated
(tweeter up)
Not Greater
than 24"
Not Greater
than 24"
IW2770LCR
IW2770LCR
Pod rotated
(tweeter up)
IW2770LCR
Figure 3.
Perforated Screen
Perforated Screen
Figure 4. Recommended center-channel placement behind a perforated projection screen.
Loudspeaker may be installed vertically or horizontally. Tweeter/Midrange Pod should be
positioned as shown.
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7
FINISHING THE INSTALLATION
CONNECTING & INSTALLING THE LOUDSPEAKER
1. Remove the magnetic grille by starting at a corner and gently pulling the grille
outwards as you work around the edges.
2. At each loudspeaker, route the wire through the provided channel to the input
connectors, then separate the loudspeaker wire so that at least 2 inches of each
conductor are free. Strip away 1/4 inch of insulation from each loudspeaker wire.
3. On each set of loudspeaker connectors, press down the spring-loaded connector,
insert the appropriate conductor, and then release the connector, as shown in
Figure 5. Gently tug on the loudspeaker wire to make sure it is held in place.
If not, repeat this procedure until it is.
NOTE: OBSERVE CORRECT POLARITY: POSITIVE (+) GOES TO THE RED POST AND NEGATIVE
(–) GOES TO THE BLACK POST. IF YOU ARE UNSURE OF WIRE POLARITY, SEE THE SECTION,
CHECKING LOUDSPEAKER PHASE ON PAGE 9.
4. Connect the other end of each loudspeaker wire to the receiver (or amplifier) in
the same way. If you are unsure of wire polarity, see the next section, CHECKING
LOUDSPEAKER PHASE on page 9.
5. Check that loudspeaker is level and then tighten the eight large screws using a #2
Phillips bit. This should pull the frame and mounting dog together (sandwiching the
drywall) so that the frame is absolutely flush with the wall surface. There should be
no gaps between the wall and the frame. See Figure 6.
6. Remove cardboard paint mask / template from the box and keep for future
potential use.
7. Turn on the home theater receiver and calibrate all loudspeakers in the system
according to the receiver manufacturer’s instructions.
IMPORTANT: DO NOT OVER TIGHTEN THE SCREWS! OVER TIGHTENING THEM MAY MAKE
THE GRILLE DIFFICULT TO INSTALL.
Figure 5. Connecting a loudspeaker
wire to the terminals.
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8
Rear View
Front View
Figure 6. Installing unit into a wall.
PAINTING THE GRILLE AND FRAME
Each StageFront FX and LCR frame and grille may be painted without the need for
primer. For best results when painting the grille, use a spray gun or airless sprayer,
thin the paint to prevent clogging of the grille holes, and apply several light coats
instead of one heavy one.
1. Install loudspeaker into wall.
2. Carefully peel adhesive-covering strips off of paint mask and align over magnets on
loudspeaker baffle. Gently press into place.
3. Paint the frame of the loudspeaker.
4. Paint the grille separately from the loudspeaker frame.
5. Reinstall grille after paint dries on all surfaces and the paint mask has been removed.
CHECKING LOUDSPEAKER PHASE
Loudspeaker wire has two conductors. On both your loudspeaker and amplifier, one
conductor is attached to the negative (–) terminals, while the other is attached to
the positive (+) terminals. Usually, the wire is marked for your convenience, but the
marking can be done in the following different ways:
■ Stripe on one wire
■ Ribbed area you can feel on one conductor
■ Different colors of metal wire on each conductor
■ Fabric strand or string wound into one of the conductors
(CONTINUED ON NEXT PAGE)
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9
Of course, there are some wires that appear completely identical. So be careful, or
you might make a connection mistake. If you do, one loudspeaker will be playing
“out-of-phase” with the other loudspeaker. A pair of out-of-phase loudspeakers
works against each other, and the sound of the two playing together will be lacking
in bass and sound “phasey.” If you suspect the sound is not right, and you cannot
see any markings on the wire, try this simple test:
1. Stand halfway between the loudspeakers.
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 volume control setting. When the sound
has a richer bass and is slightly louder, the loudspeakers are working together or
“in-phase.”
ACOUSTIC FINE TUNING
Each StageFront 70 Series In-Wall LCR loudspeaker features TREBLE and
MIDRANGE variable controls located on the front for acoustic fine-tuning after
installation, as shown in Figure 7. Adjust these controls as follows:
■ If you desire more dialog presence, increase the amount of midrange frequencies
produced by turning the MIDRANGE control clockwise.
■ If a StageFront LCR model is placed in a room with highly reflective surfaces like
glass or tile, you may wish to decrease the amount of high frequencies produced by
turning the TREBLE control counter-clockwise.
Figure 7. The IW2670LCR or IW2770LCR
TREBLE and MIDRANGE controls.
INSTALLING THE GRILLE
Starting at one corner, carefully align the magnetic grille into the frame and slowly
allow the magnets to attach. Work around the grille edge, ensuring that the grille
stays within the frame. When properly installed, the edges of the grille will be flush
in appearance with the frame.
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10
OPERATION
LISTENING AT HIGHER VOLUMES
Achieving a reasonable volume of sound in a large room requires more amplifier
power than it does in a small room. It is possible to turn the volume up so high
that the amplifier runs out of power. This creates “clipping” distortion, which will
make treble sound very harsh and unmusical. When you hear harsh-sounding
treble from any good loudspeaker, turn the volume down immediately! Those harsh
sounds are masking much more powerful ultra-high-frequency sound spikes, which
will quickly damage any fine loudspeaker. You are much less likely to damage a
loudspeaker driven by a large amplifier because it will be very loud before any
clipping distortion is produced.
CLEANING
Clean the StageFront loudspeaker with a dampened soft cloth or paper towel. If
the loudspeaker is mounted high up on a wall or ceiling, use a broom to gently
brush it off.
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11
SPECIFICATIONS
IW2550LCR
IW2650LCR
Recommended Amplifier Power
Recommended Amplifier Power
15 to 125 watts per channel
15 to 125 watts per channel
Nominal Impedance
Nominal Impedance
6 ohm nominal; 3.2 ohm minimum
6 ohm nominal; 3.2 ohm minimum
Frequency Response
Frequency Response
80Hz to 20kHz, +/- 3 dB
70Hz to 20kHz, +/- 3 dB
Sensitivity
Sensitivity
88 dB with 2.83 V pink noise input measured at 89 dB with 2.83 V pink noise input measured at
1 meter on axis
1 meter on axis
Frame Dimensions
Frame Dimensions
21-1/2" x 11" (54.6 cm x 27.9 cm)
21-1/2" x 11" (54.6 cm x 27.9 cm)
Hole Cut-Out Dimensions
Hole Cut-Out Dimensions
19-7/8" x 9-3/8" (50.5 cm x 23.8 cm)
19-7/8" x 9-3/8" (50.5 cm x 23.8 cm)
Depth From Front of Wall 3-7/8" (9.8 cm)
Depth From Front of Wall 3-7/8" (9.8 cm)
Wiring Requirements
Wiring Requirements
We recommend using 16-gauge loudspeaker
wire for runs up to 80 feet and 14-gauge
loudspeaker wire for runs up to 200 feet.
The connectors will accommodate 12 to
22-gauge wire.
We recommend using 16-gauge loudspeaker
wire for runs up to 80 feet and 14-gauge
loudspeaker wire for runs up to 200 feet.
The connectors will accommodate 12 to
22-gauge wire.
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12
SPECIFICATIONS
IW2670LCR
IW2770LCR
Recommended Amplifier Power
Recommended Amplifier Power
15 to 125 watts per channel
15 to 125 watts per channel
Nominal Impedance
Nominal Impedance
6 ohm nominal; 3.2 ohm minimum
6 ohm nominal; 3.2 ohm minimum
Frequency Response
Frequency Response
70Hz to 20kHz, +/- 3 dB
70Hz to 20kHz, +/- 3 dB
Sensitivity
Sensitivity
90 dB with 2.83 V pink noise input measured at 91 dB with 2.83 V pink noise input measured at
1 meter on axis
1 meter on axis
Frame Dimensions
Frame Dimensions
25-3/4" x 12" (65.4 cm x 30.5 cm)
25-3/4" x 12" (65.4 cm x 30.5 cm)
Hole Cut-Out Dimensions
Hole Cut-Out Dimensions
24-1/4" x 10-1/2" (61.6 cm x 26.7 cm)
24-1/4" x 10-1/2" (61.6 cm x 26.7 cm)
Depth From Front of Wall 3-7/8" (9.8 cm)
Depth From Front of Wall 3-7/8" (9.8 cm)
Wiring Requirements
Wiring Requirements
We recommend using 16-gauge loudspeaker
wire for runs up to 80 feet and 14-gauge
loudspeaker wire for runs up to 200 feet.
The connectors will accommodate 12 to
22-gauge wire.
We recommend using 16-gauge loudspeaker
wire for runs up to 80 feet and 14-gauge
loudspeaker wire for runs up to 200 feet.
The connectors will accommodate 12 to
22-gauge wire.
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13
NILES AUDIO CORPORATION
©2008 Niles Audio Corporation. All Rights Reserved. Niles, the Niles logo, and
StageFront Home Theater Solutions are registered trademarks of Niles Audio Corporation.
All other trademarks are the property of their respective owners. DS00509B
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