I n s t a l l a t i o n G u i d e
Pro1770LCR ■ Pro2770LCR ■ Pro1870LCR ■ Pro2870LCR
P r o f e s s i o n a l Q u a l i t y, C o m p a c t,
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
INTRODUCTION
The 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.
Pro1770LCR
Stock Number
Pro1870LCR
Stock Number
FG01335
FG01135
Pro2770LCR
Stock Number
Pro2870LCR
Stock Number
FG01336
FG01136
1
FEATURES AND BENEFITS
INTERLACED CARBON-FIBER WOOFERS WITH BUTYL RUBBER SURROUNDS
Provide increased sound pressure levels and dynamic theater quality sound at
sustained high-power output
FLUID-COOLED TETERON™ DOME MIDRANGE*
*Pro1770LCR & Pro2770LCR models only
Produces smooth detailed dialog
FLUID-COOLED CARBON CONE MIDRANGE*
*Pro1870LCR & Pro2870LCR models only
Delivers sustained high output levels and 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
Enables precise imaging regardless of placement and accommodates vertical or
horizontal installations
BOUNDARY GAIN COMPENSATION CONTROL*
*Pro1870LCR & Pro2870LCR models only
Allows precise room matching
VARIABLE MIDRANGE AND TREBLE CONTROLS
Enables fine-tuning after installation (+/- 3dB)
CROSS-BRACED CABINETS
Provides the ultimate in rigidity and sound clarity
BI-AMP AND BI-WIRE CAPABILITIES
Optimizes tonal balance and enhances dynamic range
POLISHED BLACK CABINET WITH SCULPTED CHARCOAL ALUMINUM GRILLE
Provides an elegant yet unobtrusive appearance
DOLBY DIGITAL® READY
The 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
2
INSTALLATION CONSIDERATIONS
RECOMMENDED AMPLIFIER POWER
For satisfactory performance, we recommend using a surround amplifier with
a power rating of 20-150 watts for the Pro1770LCR and Pro2770LCR. We
recommend an amplifier power rating of 20-200 watts for the Pro1870LCR and
Pro2870LCR. Most loudspeakers are not damaged by large amplifiers, but rather
by small amplifiers. If your system is playing at high levels, 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 9 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. Every StageFront Pro
loudspeaker features gold-plated, five-way binding posts that will accommodate up
to 12-gauge wire directly. Larger sizes can be accommodated via pin connectors.
NOTE: THESE FIVE-WAY BINDING POSTS CAN BE CONNECTED IN SEVERAL DIFFERENT WAYS (E.G.,
BANANA PLUGS, SPADE TERMINALS, AND DIRECT WIRING).
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.
3
LOUDSPEAKER PLACEMENT
NOTE: STAGEFRONT LCR LOUDSPEAKERS ARE DESIGNED FOR USE IN FRONT LEFT, CENTER OR
RIGHT-CHANNEL APPLICATIONS. FOR EFFECT CHANNEL APPLICATIONS, 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
speakers 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 1.
Figure 1. Recommended
loudspeaker placement for
front left and right channels.
Loudspeaker
Placement Zone
10'
10'
5'
Loudspeaker
Placement Zone
4
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 2 on page 6).
NOTE: DO NOT PLACE ANY STAGEFRONT LCR OR FX LOUDSPEAKER TOO CLOSE TO A DIRECT-VIEW
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 cabinet, as is likely for these models, or 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, in a
cavity in a cabinet 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. If this is not possible, the Pro1870LCR and
Pro2870LCR models feature a Boundary Compensation control to help correct any
issues that this type of placement can cause.
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 2.
■ The Pro LCR models 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 3.
(CONTINUED ON NEXT PAGE)
5
LOUDSPEAKER PLACEMENT (CONTINUED)
Pro1770LCR
(Optional Placement Above TV)
Pod rotated
(tweeter up)
Not Greater
than 24"
Pro1770LCR
Pro1770LCR
Not Greater
than 24"
Pod rotated
(tweeter up)
Pro1770LCR
Figure 2. Placing the Stagefront LCR as the center channel loudspeaker above or below a TV.
■ For installations where a perforated projection screen will be used, place the
loudspeaker, either horizontally or vertically, behind the screen at ear level, as
shown in Figure 3.
Pod rotated
Pro2870LCR
Pro2870LCR
(horizontal position)
(vertical position)
Figure 3. Recommended loudspeaker center-channel placement behind a perforated
projection screen.
6
FINISHING THE INSTALLATION
CONNECTING THE LOUDSPEAKER
1. The terminals on your loudspeaker support Bi-amp or Bi-wire connections as well
as standard connections. Please choose your preferred method as described below
in Figure 5 on page 8.
2. At each loudspeaker, route the wire 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. Using correct polarity, connect
the appropriate conductor to each five-way
binding post.
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 BELOW.
Figure 4. Connecting loudspeaker
wires to the terminals.
3. Connect the other end of the loudspeaker wires to the home theater receiver (or
amplifier) in the same way.
4. Turn on the home theater receiver and calibrate all loudspeakers in the system
according to the receiver manufacturer’s instructions.
BI-WIRE AND BI-AMP CHOICES
Bi-Wiring
In a Bi-Wired configuration, separate cables are connected from the amplifier or
receiver output terminals to the speaker input terminals for the tweeter/midrange
section and the woofers. Be sure to remove the straps linking the two sets of
input terminals on the speaker. Your amplifier and your loudspeakers may be
damaged if you do not remove the straps. This type of configuration results in
lower resistance between the amplifier and speaker than a standard connection
with the same gauge cable. Some listeners may prefer Bi-Wiring to a standard
connection with lower gauge cable.
Bi-Amping
In a Bi-Amplified system, the tweeter and midrange section are driven by a
separate amplifier than the woofer. Both amplifiers are connected to the same
preamplifier output. Use the same model amplifier for the tweeter and woofer
inputs and be sure to remove the straps linking the two sets of input terminals
on the speaker. Your amplifiers and your loudspeakers may be damaged if you do
not remove the straps.
(CONTINUED ON NEXT PAGE)
7
FINISHING THE INSTALLATION (CONTINUED)
Figure 5. Bi-Wire connection
Si275 Amp
Straps Removed
Pro2870 LCR
Pro2870 LCR
Surround Receiver
Si275 Amp1
Si275 Amp2
Figure 6. Bi-Amp connection
Straps Removed
Pro2870 LCR
Pro2870 LCR
CHECKING LOUDSPEAKER PHASE
Speaker 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
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
8
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 Pro LCR loudspeaker features a variable Treble and Bass Controls.
The 1870LCR and 2870LCR models also feature Boundary Gain Compensation and
Pod Level controls located on the front for acoustic fine-tuning after placement, as
shown in Figure 7. Adjust these controls as follows:
■ Ensure that the Treble and Midrange controls are set to Flat (0 dB).
■ If a Stagefront Pro LCR is placed in a room with highly reflective surfaces like glass or
tile or the reproduced sound is too bright, set the Treble control to – 3 dB to lower the
high frequency response.
■ Listen to dialog being reproduced on the Stagefront Pro LCR. If you want it more
pronounced, set the Midrange control to up to +3dB to enhance the mid-frequency
response.
LCR
Figure 7. Treble and Midrange
controls for the Pro1770LCR and
Pro2770LCR
Figure 8. Treble, Midrange, Pod Level and Boundary
Compensation controls for Pro1870LCR and Pro2870LCR.
(CONTINUED ON NEXT PAGE)
9
FINISHING THE INSTALLATION (CONTINUED)
The StageFront Pro1870LCR and Pro2870LCR models feature Boundary
Compensation and Pod Level controls in addition to those for Treble and Midrange
levels. These controls are also on the front for acoustic fine-tuning after placement,
as shown in Figure 8. Adjust these controls as follows:
■ If a Pro LCR is placed in a cabinet or position where the loudspeaker is closer than
2 to 3 feet from a room boundary, such as a wall, and the sound is ‘boomy’, please
switch the Boundary Compensation switch on. You may need to also adjust the
Midrange level when using this switch.
■ The Pod Level control allows you to adjust the level of the Tweeter and Midrange in
relation to the woofer(s) of the loudspeaker. If you are getting ‘boomy’ response after
adjusting the Midrange level and the Boundary Compensation switch, you may need
to increase the level of the Pod in relation to the woofer(s). If you are getting thin or
‘tinny’ response after adjusting the Tweeter level and the Boundary Compensation
switch, you may need to decrease the pod level in relation to the woofer(s).
■ Please remember to also check the settings of your receiver or processor if you
cannot achieve satisfactory sound once you have tried adjusting the controls of
the loudspeaker.
INSTALLING THE GRILLE
If desired, at each loudspeaker, carefully fit the grille to its cabinet. Starting with one
corner, gently press the grille frame around the loudspeaker’s edge, pushing it in at
each of the four recessed holes. When properly installed, the edges of the grille will
be nearly flush in appearance with the cabinet.
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 Home Theater Solutions loudspeaker with a dampened soft
cloth or paper towel.
10
SPECIFICATIONS
Pro1770LCR
Pro1870LCR
Recommended Amplifier Power
Recommended Amplifier Power
20-150 watts per channel
20-200 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
60Hz to 20kHz, +/- 3 dB
Sensitivity
Sensitivity
88 dB with 2.83 V pink noise input measured at 90 dB with 2.83 V pink noise input measured at
1 meter on axis
1 meter on axis
Dimensions
Dimensions
8-7/8” W x 14-5/8” H x 12-5/8” D with grille
11” W x 17-1/2” H x 15-3/8” D with grille
Depth is 12-3/8” without grille
Depth is 15-1/4” without grille
Wiring Requirements
Wiring Requirements
We recommend using 16-gauge loudspeaker
wire for runs up to 80 feet and 14-gauge
speaker 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
speaker wire for runs up to 200 feet. The
connectors will accommodate 12 to 22
gauge wire.
Pro2770LCR
Pro2870LCR
Recommended Amplifier Power
Recommended Amplifier Power
20-200 watts per channel
20-150 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
55Hz to 20kHz, +/- 3 dB
60Hz to 20kHz, +/- 3 dB
Sensitivity
Sensitivity
91 dB with 2.83 V pink noise input measured at
1 meter on axis
89 dB with 2.83 V pink noise input measured at
1 meter on axis
Dimensions
Dimensions
17-1/2” W x 19-1/8” H x 15-3/8” D with grille
14-5/8” W x 14-5/8” H x 12-5/8” D with grille
Depth is 15-1/4” without grille
Depth is 12-3/8” without grille
Wiring Requirements
Wiring Requirements
We recommend using 16-gauge loudspeaker
wire for runs up to 80 feet and 14-gauge
speaker 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
speaker wire for runs up to 200 feet. The
connectors will accommodate 12 to 22
gauge wire.
11
LIMITED WARRANTY
NILES AUDIO CORPORATION (“NILES”) WARRANTS ITS PASSIVE LOUDSPEAKER PRODUCTS (THOSE NOT REQUIRING
AC OR BATTERY POWER) 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
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Please fill in your product information and retain for your records.
Model_____________________ Serial No._________________ Purchase Date________
12
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Model Purchased_________________________________________________________
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13
NILES AUDIO CORPORATION
©2006 Niles Audio Corporation. All Rights Reserved. Niles and the Niles logo are registered trademarks of
Niles Audio Corporation. Stagefront Home Theater Solutions is a trademark of Niles Audio Corporation.
All other trademarks are the property of their respective owners. DS00508A
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