Atlantic Technology 251.1 LR User manual

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Instruction
Manual
A TECHNOLOGY
tlantic
Models
251.1 LR
253.1 C
254.1 SR
System 250.1
High Performance Loudspeaker System

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A TECHNOLOGY
tlantic
Models 251.1 LR, 253.1 C, and 254.1 SR
2
System 250.1
High Performance Loudspeaker System
Thank you for choosing Atlantic Technology’ home theater products. Your new speaker
system is precision crafted to give you years of enjoyable, trouble free service. This
manual covers the Atlantic Technology System 250.1 series of speakers for home
theater. It will show you how to incorporate the following System 250.1 components
into your present setup, as well as how to assemble a complete system. The Model 262
PBM Subwoofer is covered in a separate manual. The entire 250.1 system has been
optimized for use with Dolby Digital AC-3.
The Model 251.1 LR Front Channel Speakers are two-way systems for use with a
quality subwoofer, such as the Atlantic Technology Model 262 PBM. Each speaker
contains two 4" polypropylene, long-throw woofers, and a 3/4" ferrofluid cooled tweeter
in an acoustically inert MDF cabinet.
The Model 253.1 C Timbre Adjusting Center Channel Speaker contains the
same two 4" polypropylene long-throw woofers and a 3/4" ferrofluid cooled tweeter. It is
designed for use in home theater systems that use a dedicated center channel speaker.
The Model 254.1 SR On-Wall/In-Wall Surround Speaker is intended for use in
audio/video sound systems with dedicated surround channel speakers. Each speaker has
two 4" polypropylene woofers, as well as two 1/2" polypropylene tweeters which are
angled and phased to produce ambience without localization for movie surround
soundtracks. Its wide bandwidth and unique construction makes it especially suitable
for Dolby Digital AC-3 applications.
Although the speakers in the Atlantic Technology System 250.1 are acoustically and
cosmetically matched to each other, they may also be used with a wide variety of other
speaker systems from other manufacturers with satisfying results.
Note: The 254.1 SR is not intended for use as a regular right and left front channel stereo
speaker or satellite. Its spatial performance characteristics are not designed for this purpose.
In the Atlantic Technology 250.1 Series of components, the Model 251.1 LR fills this role.
Connection
We recommend that you connect your new System 250.1 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 251.1 LR, 253.1 C, and 254.1 SR
3
You can connect your System 250.1 speakers by using
spade lugs or “banana” connectors, or by removing 1/2"
of insulation from each wire end, twisting the strands of
wire together, placing the wire through one of the post
holes and screwing down the nut tightly.
It is important to observe polarity while making speaker
connections: red (+) terminals on the amplifier to red (+)
on the speaker, black (-) on the amplifier to black (-) on
the speaker. Look carefully at the wires you are using and note that one of the wires in
each pair is marked by either a different color, printing, ridges, or a thread intertwined
with the wire strands. By convention, the marked wire is connected to the red (+)
terminal.
Whether your are connecting a complete System 250.1, or adding one speaker compo-
nent to your present system, the wiring should look like the diagram in Figure 2. Before
turning on the amplifier, be certain that no stray wire strands are touching across the
two terminals as this might damage your amplifier.
Finally, check the polarity of your front speakers by listening to some music. If the
sound seems hollow, spread out and has weak bass, recheck your connections for proper
polarity and reverse the connections if necessary.
Figure 1:
Speaker Wiring
Terminals
Figure 2:
Typical wiring
diagram for
speakers in a
home theater.

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A TECHNOLOGY
tlantic
Models 251.1 LR, 253.1 C, and 254.1 SR
4
Placement
The design of the System 250.1 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 Figure 3 as a starting point. Feel free to experiment.
Home Theater
For a home theater system, place your Model 251.1 LR speakers on either side of the
television. All of the System 250.1 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 253.1 C
should be placed
directly on or under
your television. Place
the speaker base so
that the foot cutouts
are facing forward.
Then, pivot the
speaker on its base
and tilt the speaker so
that it points directly
at the listener.
The 254.1 SR’s size and
shape allows greater
flexibility in place-
ment than most
conventional 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.
Note: The orientation of the 254.1 is important to the proper generation of the surround
soundfield. Mount each speaker on the wall or shelf so that the “direct” soundfield is directed
toward the front of the room, and the “ambient” soundfield is directed toward the rear.
There is an arrow on the back of each speaker to guide you.
Figure 3:
Typical arrange-
ment for speakers
in a home theater.
For best results,
place the surround
speakers within the
shaded areas.

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A TECHNOLOGY
tlantic
Models 251.1 LR, 253.1 C, and 254.1 SR
5
Music Only System (Model 251.1 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 253.1 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 250.1 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 253.1 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 “251.1” position.
This approximates the Atlantic Technology 251.1 LR speakers. Next, use your surround
sound receiver/decoder’s “test” mode to generate “hiss” from each speaker and adjust
the 253.1’s controls for the closest match.
Although an absolute 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 down slightly to
compensate for the natural brightness of many movie soundtracks.
Note: Some surround sound decoders and receivers offer a choice of “normal” or “wide-
band” modes for the center channel. The Model 253.1 C was designed to be used in the
“normal” mode.
Figure 4:
Timbre adjustment
control knobs on
back panel of
253.1 C Center
Channel Speaker.

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A TECHNOLOGY
tlantic
Models 251.1 LR, 253.1 C, and 254.1 SR
6
Mounting
The 251.1 LR and the 254.1 SR speakers can be mounted in a variety of ways:
On speaker stands. Atlantic Technology 156 ST speaker stands provide an ideal height
(29" above the floor) and fit for most rooms. They are available in black or white.
On the wall. To mount your speakers on a wall, we have provided metal key-hole
brackets. Simply place the bracket over the oval recess on the rear of the speaker and
fasten it using the enclosed #6 x 1" screws. Pilot holes are provided.
For greatest flexibility, use pivoting ball-and-socket wall brackets of suitable weight
rating (e.g., Omnimount 50 Series, Vogel, etc.) usually available from your local audio/
video retailer.
For safety, please use suitably secured wall anchors (such as molly-bolts), or screws
driven into wall studs.
On a bookshelf. Adhesive rubber feet are included.
In the wall. The Atlantic Technology 254 INRF in-wall kit includes all the necessary
hardware and trim. (254.1 SR only)
Listening Levels and Power Handling–IMPORTANT!
The power recommendation for these speaker components assumes that you will not
operate your amplifier/receiver in a way that produces distortion. Even rugged speakers
like System 250.1 can be damaged by a moderately powered system driven beyond its
intended capacity. The harsh amplifier clipping that occurs in this situation will cause
damage to the speaker system that is not covered by the warranty.
The System 250.1 will play very loudly when provided with enough power to do so.
Again, consult your dealer or Atlantic Technology for additional information.
Care of your Speakers
Clean your speaker cabinets using a soft cloth moistened with a mild, non-abrasive
glass cleaner being careful not to wet the individual drivers or the edges of the cabinet.
After carefully removing the grilles from the speakers, clean them with a quick pass
from a vacuum cleaner with a brush attachment. This should remove any dust
accumulation.
Avoid placing your speakers in direct sunlight that may, over time, fade the finish.

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A TECHNOLOGY
tlantic
Models 251.1 LR, 253.1 C, and 254.1 SR
7
System 250.1 Specifications
Description 251.1 LR 253.1 C 254.1 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) 0.5" polypropylene
(1) 0.75" dome tweeter (1) 0.75" dome tweeter (2) 4" polypropylene
Frequency 50Hz – 20kHz 80Hz – 20kHz 80Hz – 20kHz
Response (±3dB)
Nominal 8 Ω 8 Ω 8 Ω
Impedance
Sensitivity 90dB 90dB 90dB
Recommended 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) 12lbs 10.25lbs 8.1lbs
5.45kg 4.65kg 3.63kg
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.
Dolby Stereo and Dolby Digital AC-3 are trademarks of Dolby Laboratories Licensing Corporation.

A TECHNOLOGY
tlantic
343 Vanderbilt Avenue
Norwood, MA 02062
[phone]
For Future Reference
Record your 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
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.
020-1250
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