Atlantic Technology 251 LR User manual

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Instruction
Manual
A TECHNOLOGY
tlantic
Models
251 LR
253 C
254 SR
System 250
High Performance Loudspeaker System

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A TECHNOLOGY
tlantic
Models 251 LR, 253 C, and 254 SR
2
System 250
High Performance Loudspeaker System
Welcome to Atlantic Technology’s world of excellence in sound reproduction. Your new
speaker system is precision crafted to give you years of enjoyable trouble free service.
This manual covers the Atlantic Technology System 250 series of speakers for
home theater. It will show you how to incorporate the following System 250 compo-
nents into your present system as well as how to set up a complete system. The Model
262 PBM Subwoofer is covered in a separate manual.
The Model 251 R Front Channel Speakers are two-way systems for use with a
quality subwoofer such as the Atlantic Technology Powered Bass Modules. Each speaker
contains two 4" polypropylene long-throw woofers and a 3/4" ferrofluid cooled tweeter
in an acoustically inert MDF cabinet.
The Model 253 C Timbre Adjusting Center Channel Speaker contains two high
power 4" polypropylene woofers and a 3/4" ferrofluid cooled tweeter. It is designed for
use in home theater systems that use a Dolby Pro Logic decoder.
The Model 254 SR On-Wall/In-Wall Surround Speaker is intended for use in
audio/video sound systems with a Dolby Pro Logic receiver (or a Dolby Pro Logic
decoder and a surround amplifier). Each speaker has one 4" polypropylene woofer as
well as two 3-1/2" polypropylene mid-tweeters that are angled and phased to produce
ambience without localization for movie surround sound tracks.
Although the speakers in the Atlantic Technology System 250 are acoustically and
cosmetically matched to each other they may also be used with a wide variety of other
speaker systems.
Note: The 254 SR is not intended for use as a regular right and left front channel stereo
speaker or satellite. ts spatial performance characteristics are not designed for this purpose.
n the Atlantic Technology 250 Series of components, the Model 251 LR fills this role.
Connection
We recommend that you connect your new System 250 speaker components using high
quality stranded wire of 18 gauge or larger for lengths up to 25 feet. Use 16 gauge or
larger for longer runs of wire. Contact your local audio/video specialist for more specific
information.
Warning: To prevent risk of electrical shock or damage to your equipment, always switch off
the amplifier or receiver when making connections to the speaker.

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A TECHNOLOGY
tlantic
Models 251 LR, 253 C, and 254 SR
3
You can connect your System 250 speakers by using
spade lugs or “banana” connectors, or by removing 1/2"
o insulation rom each wire end, twisting the strands o
wire together, placing the wire through one o the post
holes and screwing down the nut tightly.
It is important to observe polarity while making speaker
connections: red (+) terminals on the ampli ier to red (+)
on the speaker, black (-) on the ampli ier to black (-) on
the speaker. Look care ully at the wires you are using and note that one o the wires in
each pair is marked by either a di erent color, printing, ridges, or a thread intertwined
with the wire strands. Conventionally, the marked wire is connected to the red (+)
terminal.
Whether your are connecting a complete System 250, or adding one speaker compo-
nent to your present system, the wiring should look like the diagram in Figure 2. Be ore
turning on the ampli ier, be certain that no stray wire strands are touching across the
two terminals as this might damage your ampli ier.
Finally, check the polarity o your ront speakers by listening to some music. I the
sound seems hollow, spread out and has weak bass, recheck your connections or proper
polarity and reverse the connections i necessary.
Figure 1:
Speaker Wiring
Terminals
Figure 2:
Typical wiring
diagram for
speakers in a
ome t eater.

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A TECHNOLOGY
tlantic
Models 251 LR, 253 C, and 254 SR
4
Placement
The design of the System 250 provides you with maximum flexibility when creating a
large, seamless, acoustically accurate soundfield for your home theater or music system.
The best placement of the various components will vary from system to system. Use the
following placement guidelines and igure 3 as a starting point. eel free to experiment.
Home Theater
or a home theater system, place your Model 251 LR speakers on either side of the
television. All of the System 250 speakers (except the Model 262 PBM Powered Bass
Module) are magnetically shielded so that they will not interfere with your television
picture. The left front and right front speakers should be far enough apart that you get a
good stereo image, but not so far apart that the sound seems to come directly from the
speakers, distracting you from the picture. If you are using a center channel speaker, a
wider separation of the left and right front speakers is usually possible.
The Model 253 C should be placed directly on or under your television. Place the
speaker base so that the foot cutouts are facing forward. Then, set the speaker on its
base and tilt the speaker so that it points directly at the listener.
The 254 SR’s size and shape allows greater flexibility in placement than most conven-
tional surround loudspeakers. Due to their spatial characteristics, it is possible to place
the speakers virtually anywhere, but usually the best location is nearly straight out to
the sides of the primary listening area, either at ear level or 1-2 feet above.
Figure 3:
Typical arrange-
ment for speakers
in a ome t eater.
For best results,
place t e surround
speakers wit in t e
s aded areas.

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A TECHNOLOGY
tlantic
Models 251 LR, 253 C, and 254 SR
5
Music Only System (Model 251 LR only)
If you are setting up a music only system, begin with these general guidelines:
● The distance between your speakers should be about one-half their distance from
your favorite listening position.
● The front of the speakers should point straight at you.
● The distance from each speaker to its three closest room surfaces should be different.
● In most rooms, you should not place your speakers in the corners.
Next, be creative Try placing your speakers along the long wall instead of the short one.
Toe the speakers in or point them straight ahead. Pull them away from the wall or push
them close. Don’t be timid. You will find that moving your speakers, even a few inches,
can greatly change their sound.
Timbre Adjustments (Model 253 C only)
The home theater experience is best enjoyed when sounds remain consistent in tonal
balance when panned across the soundstage. For that reason, the Atlantic Technology
System 250 was designed with acoustically matching drivers.
To help achieve this goal when using front speakers from another manufacturer, we
have provided two controls (Figure 4) on the rear of the 253 C enabling you to adjust its
tonal characteristics to emulate those of your front left and right speakers.
Begin the adjustment procedure by turning both control knobs to the “251” position.
This approximates the Atlantic Technology 251 LR speakers. Next, use your Dolby Pro
Logic receiver/decoder’s “test” mode to generate “hiss” from each speaker and adjust
the 253’s controls for the closest match.
Although a perfect match is not usually possible, fine tuning the controls while watching
high quality movies will generally yield excellent results. If most of your listening is Dolby
Stereo movies, you may wish to adjust both controls to compensate for the natural
brightness of many movie soundtracks. You may use the Cinema EQ position as a guide.
Note Some Dolby Pro Logic decoders and receivers offer a choice of normal” or wide-band”
modes for the center channel. The Model 253 C was designed to be used in the normal” mode.
Figure 4:
Timbre adjustment
control knobs on
back panel of
253 C Center
Channel Speaker.

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A TECHNOLOGY
tlantic
Models 251 LR, 253 C, and 254 SR
6
Mounting
The 251 LR and the 254 SR speakers can be mounted in a variety of ways:
On speaker stands. At antic Techno ogy 156 ST speaker stands provide an idea height
(29" above the f oor) and fit for most rooms. They are avai ab e in b ack or white.
On the wall. For greatest f exibi ity, use At antic Techno ogy 157 WB wa brackets
with their pivoting ba -and-socket joint.
To f ush mount your speakers, we have provided meta key-ho e brackets. Simp y p ace
the bracket over the ova recess on the rear of the speaker and fasten it using the
enc osed #6 x 1" screws. Pi ot ho es are provided for both brackets.
For safety, p ease use suitab y secured wa anchors (such as mo y-bo ts), or screws
driven into wa studs.
On a bookshelf. Adhesive rubber feet are inc uded.
In the wall. The At antic Techno ogy 254 INRF in-wa kit inc udes a the necessary
hardware and trim. (254 SR on y)
Listening Levels and Power Handling
The power recommendation for these speaker components assumes that you wi not
operate your amp ifier/receiver in a way that produces distortion. Even rugged speakers
ike System 250 can be damaged by a moderate y powered system driven beyond its
intended capacity. The harsh amp ifier c ipping that occurs in this situation wi cause
damage to the speaker system that is not covered by the warranty.
The System 250 wi p ay very oud y when provided with enough power to do so.
Again, consu t your dea er or At antic Techno ogy for additiona information.
Care of your Speakers
C ean your speaker cabinets using a soft c oth moistened with a mi d, non-abrasive
g ass c eaner being carefu not to wet the individua drivers or the edges of the cabinet.
After carefu y removing the gri es from the speakers, c ean them with a quick pass
from a vacuum c eaner with a brush attachment. This shou d remove any dust
accumu ation.
Avoid p acing your speakers in direct sun ight that may, over time, fade the finish.

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A TECHNOLOGY
tlantic
Models 251 LR, 253 C, and 254 SR
7
System 250 Specifications
Description 251 LR 253 C 254 SR
Type Sealed-box, 2-way Sealed-box, 2-way, Sealed-box, spatially-enhanced
Adjustable Timbre surround speaker
Drivers (2) 4 polypropylene (2) 4 polypropylene (2) 3.5 polypropylene
(1) 0.75 dome tweeter (1) 0.75 dome tweeter (1) 4 polypropylene
Frequency 50Hz – 20kHz 80Hz – 20kHz 50Hz – 12.5kHz
Response (±3dB)
Nominal 8 Ω 8 Ω 8 Ω
Impe ance
Sensitivity 90dB 90dB 90dB
Recommen e 10 – 150W 10 – 150W 10 – 150W
Amplifier Power
Size (W x H x D) 6.0 x 13.0 x 8.5in 15.0 x 6.75 x 7.75in (including base) 9.5 x 10.5 x 6.4in
152 x 330 x 216mm 380 x 152–170 x 197mm 241 x 267 x 163mm
Weight (each) 9.11lbs; 4.1kg 10.0lbs; 4.5kg 8.4lbs; 3.82kg
Specifications are those in effect at the time of printing. Atlantic Technolog reserves the right to change
specifications or designs at an time without notice.
Dolb Stereo and Dolb Pro Logic are trademarks of Dolb Laboratories Licensing Corporation.

A TECHNOLOGY
tlantic
343 Vanderbilt Avenue
Norwood, MA 02062
[phone]
For Future Reference
Record our speaker(s) serial number(s) and date of purchase here:
Model Number Serial Number Date of Purchase
Model Number Serial Number Date of Purchase
Model Number Serial Number Date of Purchase
The serial number is found on the back of the speaker near the connecting terminals.
010-1251
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