Atlantic Technology | A-2000 | Instruction manual | Atlantic Technology A-2000 Instruction manual

In Wall Closed Box Speaker
Instruction Manual
IWCB-727 THX Select
Safety Precautions
IWCB-727 THX In-Wall Closed Box Speakers
Table of Contents
2 Model IWCB-727 THX
3 Important Considerations Before Installation
Recommended Wire Sizes
Location Considerations
Room Acoustics
Stereo Music Listening
Home Theater Systems
Removing and Installing the Grille
Cutting the Opening
Installing the Mounting Frame
Painting the Speaker Assembly
Speaker Connection and Assembly
Installing the Speaker Enclosure Into the Frame
HF (High Frequency) Level Control
Boundary Compensation Control
Directional Vector Control™
IR Knockout
3 Speaker Placement
5 Mounting the IWCB-727
5 Installation of the IWCB-727 in New Construction
5 Installation of the IWCB-727 in Existing Construction
7 Front Panel Controls
7 Specifications
Model IWCB-727 THX
In Wall Closed Box Speaker
Thank you for purchasing Atlantic Technology products. Our speaker systems have been designed to deliver exceptional sound and value. We hope
you like what you hear from them, and are happy with your decision to
buy them.
Please take a few moments to read these instructions. They’re intended not
only to tell you how to mount the speakers, but how to get the best performance from them.
What’s THX?
THX is a series of standards and technologies originally developed by
LucasFilm Ltd. (of Star Wars fame) and now an entity unto itself. These
technologies and standards are intended to ensure that what you hear and
see on your A/V system, as closely as possible, matches what the director/
artist/engineer heard and saw during the final mixing of the source material. THX standards are intended to enhance every type of viewing and
listening experience including the latest discrete multi-channel digital formats. Please note however that, although there is proprietary THX electronic
processing, THX is not a surround format.
THX Select standards (IWCB-727) are based on a 2000 cubic foot room (L
x W x H = cu. ft.). This does not mean Select certified components must
be used in rooms this exact size. The room sizes simply provide a frame
of reference, as the standards specify that the system must deliver certain
performance minimums (volume, frequency response, etc.) in the specified
space. For more information, see the THX website at
For Future Reference
Record your serial numbers and date of purchase here:
Model Number
Serial Number
Date of Purchase
The serial number is found on the back panel.
Copyright © 2007 Atlantic Technology International.
Specifications are those in effect at the time of printing. Atlantic Technology reserves the
right to change specifications or designs at any time without notice.
Speaker Placement
Instruction Manual
Important Considerations Before
Recommended Wire Sizes
The longer the wire run, the heavier the wire should be. Use the following
recommendations as a guide for your installation. And if you’re in doubt,
remember that it never hurts to get the next heavier grade of wire. Also note
that lower gauge numbers equal heavier wire sizes.
Speaker Placement
For all the following situations, it’s recommended that you first place small
box speakers in the proposed locations, just to get a good idea of how
that location will sound. In-wall speakers are tough to move once they’re
Important: Using Atlantic’s Exclusive Directional Vector Control™
(see Page 7 for more details)
Wire Run Wire Gauge:
<15 ft. 16 ga.
15 to 30 ft. 14 ga.
>30 to 50 ft. 12 ga.
Location Considerations
A major determinant of any speaker’s sound quality is its location in the
room. With in-wall speakers there are fewer placement options than with
free-standing speakers, so giving some thought to location can really pay
off. Our In-Wall Closed Box systems have been designed to minimize the
detrimental effects wall mounting can have on sound, so they sound better
than conventional open-back in-wall speakers.
Room Acoustics
Hard surfaces create lots of sound reflections in the room while soft surfaces
tend to absorb sound. Note the speakers’ location in terms of proximity to
glass and other highly sound reflective or absorptive surfaces. A simple set
of curtains or an area rug can make a major difference in sound quality and
intelligibility by reducing excessive reflections.
For all the following placement instructions, it’s important to bear in mind
that for aesthetic considerations, many people prefer to mount their in-wall
speakers well above seated ear level, as doing so minimizes the speakers’
visual intrusion on the room.
In those cases, simply engage the DVC “on” and the midrange output of
the speakers—which determines both intelligibility and localizability—is
directed down towards the listener’s ears, even though the speakers are
mounted high up on the walls.
For those situations where localizability is not desired, such as background
music (sometimes called “whole-house audio”) or surround channel use,
leave the DVC “off.”
Stereo Music Listening
For stereo music reproduction, place the speakers at approximately ear
level when seated, with both speakers on the same wall facing the prime
listening location. A separation of approximately 6 to 8 feet between the
left and right speakers is usually good. Ideally, the distance between the
two speakers will be close to the same as the distance from the speakers to
the listening position.
Home Theater Placement
IWCB-727 THX In-Wall Closed Box Speakers
Home Theater Systems
Front Speaker Array should be
placed as close to ear level as
Optional Dipole/Bipole
Speakers should be
placed directly to the
sides of the seating area
and approximately
1-2 feet (.3-.6 meter)
above the listener’s ear
Optional Direct Radiator Speakers
should be placed slightly behind the
listening position, above ear level.
Optional Surround Back Speakers
should be placed approximately 1-2 feet
(.3-.6 meter) above the listener’s ear
level. Direct radiator or dipole/bipole
speakers may be used here.
Today’s home theater systems require you to place six or
more speakers in your room. For the most convincing
theater effects, speaker placement must be very carefully
thought out. This is especially true with in-wall speakers,
since their installation is permanent!
Left/Center/Right Locations The front three speakers
should be at or just above ear height when seated, just as
with stereo speakers. Try to keep the vertical position of the
three front speakers within 18 inches of each other, as this
will maintain smooth, believable left-center-right pans.
The spacing of the left-right speakers can be a little wider
than with 2-channel stereo speakers, since in a theater system, the center channel speaker reproduces the on-screen
effects and anchors the center image. Left-right spacing of
about 8 to 10 feet usually works well.
Surround Speakers In order to achieve optimum performance we strongly recommend Atlantic Technology Dipole
or TriVector™ surround speakers. If you are using our dedicated surround speakers please follow the placement recommendations included in their installation instructions.
Non-Dipole Surrounds The most realistic surround effects
occur when the listener can’t localize the actual location
of the surround speaker. If you decide to use the In-Wall
Close Box speakers as surround speakers, mount them
above the listeners’ ears, slightly behind the listening area
either on the side or rear walls. Make sure the DVC is in the
“off” position.
NOTE: The IWCB-727 is not magnetically shielded. If
you are using them with an old CRT-type television,
be sure they are at least 12 inches away from the picture tube to prevent video interference.
Instruction Manual
Mounting the IWCB-727
NOTE: We always recommend a professional be involved in the
installation of IWCB speakers.
The IWCB-727 speaker can be easily mounted in most any standard wall
material, from ½ to 1½ inches thick. Its rotating wall clamps firmly fix it
to the wall surface after the proper cutout has been made. Here are some
important precautions to take before mounting:
Keep the sides of the actual mounting hole at least ½ inch away from
beams or studs to ensure that the clamps have adequate room to rotate.
A stud or other obstruction that’s too close will stop them from properly
doing their job.
Installation of the IWCB-727 in Existing
Removing and Installing the Grille
Remove the grille from the speaker using an awl or the point of a drywall
screw in a grille opening near one of the grille corners. Slowly pry the grille
out, being careful not to damage the speaker’s frame or its finish.
To re-install the grille later, press it carefully into the appropriate opening in
the frame assembly. Since it’s designed to fit snugly, please take your time
and use care when installing the grille.
Cutting the Opening
Installation of the IWCB-727 in New
Atlantic Technology offers an optional Rough-in Frame Kit to ease installation in new construction. Instructions for its use are included with that kit.
20 3⁄8”
11 1⁄8”
Mounting Template
Mount frame as shown,
with IR knockout in
upper-right corner.
Remove scrim before
painting grille.
After determining the best location for the speaker as outlined above, use
the enclosed template to cut the proper size hole.
11 1⁄8” x 20 3⁄8”
WARNING: Exercise extreme care before making any wall cuts to
ensure that you will not cut through any wires, pipes, or other items
that may be in the wall. You may sometimes, but not always, be able
to determine the approximate location of wires and pipes by looking
at the locations of nearby outlets and plumbing. But their location or
absence is never an assurance that there is not something within the
wall cavity.
IWCB-727 THX In-Wall Closed Box Speakers
Installing the Mounting Frame
Speaker Connection and Assembly
The clamping mechanism allows
the wall material to range from
½ to 1½ inches (13 to 38 mm) in
thickness. There must be a minimum depth behind the wall face
of 3 5⁄8” (92 mm). As noted above,
be sure to keep the edges of the
cutout at least ½ inch (13 mm)
away from any stud or obstruction, as the rotating clamps will
not operate properly if you don’t.
The speaker enclosure (the black
box with the drivers mounted in
it) is designed to mount into the
white frame, after the frame is
mounted into the wall.
Insert the frame into the cutout and using a level or square carefully align
it so it is level. Tighten the mounting screws, which will cause the attached
clamps to rotate and position themselves properly behind the wall.
Strip about ½” (13 mm) of insulation from the connecting wires. Connect
them to the appropriate push terminal, being careful to observe polarity
(positive to the red terminal, negative to the black terminal).
Continue to tighten until the frame is snug in the wall. You want the bezel
to conform to the wallboard, and the frame not to rattle from the speaker’s
vibration, but be very careful not to overtighten the screws.
Installing the Speaker Enclosure into the Frame
Painting the Speaker Assembly
The white plastic frame and the
metal grille may be left as is, or
painted to match your décor. You
can paint the frame before or after
it is installed in the wall. Spray
painting (using slightly thinned
paint) is the best method to use for
painting the grille. Before painting,
carefully peel off the scrim cloth
from inside the grille. After painting the grille, use air pressure to
“blow out” any grille holes that are
filled in with paint, then carefully replace the scrimcloth.
Once the frame is mounted in the wall, the speaker enclosure simply fits
into the frame. Note that there is a foam anti-vibration pad affixed to the
rear panel of the enclosure. This pad will eliminate any slight vibrations
that occur if the back of the speaker enclosure contacts the wallboard in
the wall cavity. Due to the usual slight dimensional variances in home
construction, the IWCB either may or may not contact the wall surface
behind it.
Use the included screws to attach the enclosure to the mounting frame, but
be very careful not to overtighten the screws.
Front Panel Controls
Instruction Manual
Front Panel Controls
The IWCB speakers have three
controls that help optimize
the speaker’s performance
regardless of mounting location or room acoustics.
If it’s necessary to mount the speaker closer than 12 inches to the ceiling or
corner, you may find that by switching the Boundary Compensation control
“on,” the speaker sounds better. We recommend that you try the control in
both positions and see if it helps in your particular installation.
Directional Vector Control™
Oftentimes, it is visually advantageous to mount the
speaker high up on the wall, as this puts the speaker
above the field of vision and thus prevents any intrusion
by the speaker into the room’s décor.
HF (High Frequency) Level Control
This control adjusts the relative level of high frequency
output to compensate for varying room acoustics or
placement behind a screen.
“THX” is for absorptive, acoustically “dead” rooms (or
when the speaker is behind a movie screen). Use this
position to increase the HF level and restore the proper sparkle and
liveliness to the sound.
“0” is for rooms of average absorptive characteristics.
“-“ should be used in rooms that are highly reflective, with hard floors
and exposed windows.
The setting of the HF control is mostly a matter of personal taste, so try it
in all three positions and see which one is preferred.
Boundary Compensation Control
Large room boundaries, such as floors, walls, and ceilings, reinforce sound by acting essentially as acoustic
“mirrors.” When the speaker is mounted too close to the
corner or a wall/ceiling intersection, this sonic “reinforcement” often results in an unnatural heaviness or coloration of the sound.
2½-way M-T-M array
Woofer (2) 6 ½” (165mm) GLH*
Tweeter 1" (25mm) LRT™ soft dome
Frequency Response 75Hz – 20kHz ±3dB
Nominal Impedance
6 Ohms
Crossover Frequency
800Hz, 2.2kHz
Recommended Power
10 – 140 Watts RMS
Dimensions (W x H x D)
12 5⁄16 x 21 5⁄8 x 3 7⁄8"
312 x 547 x 100mm
Cutout Dimensions
(W x H x D)
11 1⁄8 x 20 3⁄8”
283 x 518mm
Net Weight
13lbs; 5.9kg each
*Graphite Loaded Homopolymer
Specifications are those in effect at the time of printing. Atlantic Technology reserves the right
to change specifications or appearance at any time without notice.
Dolby Digital, 5.1, Dolby Stereo and Dolby Pro Logic are trademarks of Dolby Laboratories
Licensing Corporation. DTS is a registered trademark of DTS Technology.
Manufactured under license from THX Ltd. THX is a trademark of THX Ltd. which may be registered in some jurisdictions. All rights reserved.
However, acoustically, the best location for a speaker is at
seated ear level, about 3-4 feet off the floor.
The DVC electronically directs the midrange sound at the listener’s ears,
even when the speaker is mounted high up on the wall.
The “on” position directs the sound down at the listeners when using the
speakers as LCR theater speakers or primary stereo music speakers.
The “off” position fires the sound straight out from the speakers—above
the listener’s heads—which is perfect for non-localizable surround use, or
for room-filling background music (“whole house audio”) use.
IR Knockout
There’s an IR “knockout” plug in the upper right corner
of the front baffle. If you are using a multi-room control system, you can install a standard IR receiver in the
knockout hole.
Should you have any questions or problems please feel free to contact us at
781-762-6300 or through our web site,
343 Vanderbilt Avenue Norwood, MA 02062 (781) 762-6300
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