Atlantic Technology 251.1 LR User manual

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Instruction

Manual

TECHNOLOGY

tlantic

Models

251.1 LR

253.1 C

254.1 SR

System 250.1

High Performance Loudspeaker System

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TECHNOLOGY

tlantic

Models 251.1 LR, 253.1 C, and 254.1 SR

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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TECHNOLOGY

tlantic

Models 251.1 LR, 253.1 C, and 254.1 SR

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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TECHNOLOGY

tlantic

Models 251.1 LR, 253.1 C, and 254.1 SR

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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TECHNOLOGY

tlantic

Models 251.1 LR, 253.1 C, and 254.1 SR

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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TECHNOLOGY

tlantic

Models 251.1 LR, 253.1 C, and 254.1 SR

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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TECHNOLOGY

tlantic

Models 251.1 LR, 253.1 C, and 254.1 SR

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

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.

TECHNOLOGY

tlantic

343 Vanderbilt Avenue

Norwood, MA 02062

(617) 762-6300

For Future Reference

Record your speaker(s) serial number(s) and date of purchase here:

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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