System 270THX® THX Select Certified
Home Theater Loudspeaker System
C o v e r s M o d e l s 2 7 1 L R , 2 7 3 m C , a n d 2 7 4 t S R
Atlantic Technology®
I N N O V A T I V E H O M E T H E A T E R
343 Vanderbilt Avenue Norwood, MA 02062 (781) 762-6300 www.atlantictechnology.com
Manual Instruction
Models 271 LR, 273m C, and 274t SR |
Atlantic Technology® |
SYSTEM 270 THX |
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High Performance THX Select Certified
Home Theater Loudspeaker System
Thank you for choosing Atlantic Technology home theater products. Your new speaker components are precision crafted to give you years of enjoyable, trouble free service. This manual covers the System 270 THX speakers for home theater. It will show you how to incorporate System 270 THX components into your present setup, as well as how to assemble a complete system. The Model 272 PBM Subwoofer is covered in detail in a separate manual. System 270 THX has been optimized for use with all surround sound formats including Dolby Surround®, Dolby Pro-Logic®, Dolby Digital 5.1® and DTS® digital surround.
NOTE: Although it may seem like asking for directions while driving, please take a few moments to read all
of this booklet. It has many helpful tips and ideas on properly setting up and using your system. We promise that if you take the time to read and follow these tips you’ll get better system performance. … Honest.
What’s THX?
THX is a series of standards and technologies developed by Lucasfilm Ltd. (of Star Wars fame) intended to ensure that what you hear and see on your home system, as closely as possible, matches what the director heard and saw during the final production of the film. THX is intended to enhance every type of viewing 
and listening experience including the latest discrete multi-channel digital formats. Please
note however that THX is not a separate surround format.
THX Select standards are based upon a room size of 2000 cubic feet (L x W x H). THX Ultra standards are based upon a room size of 3000 cubic feet. This does not mean these 
components must be used in rooms this exact size. The room sizes simply provide a frame
of reference, as they indicate that these systems must deliver a minimum level of performance in these specified room sizes. System 270 THX is THX Select certified.
Components
Model 271 LR Front Channel Speaker
The Model 271 LR Front Channel Speakers are high performance, two-way systems intended for use only with a quality subwoofer, such as the Atlantic Technology Model 272 PBM THX. Each speaker contains two 5-1/4" IMG (injection-molded graphite) woofers, and a 1" Ferrofluid™ cooled silk dome tweeter with a powerful neodymium magnet structure. These components are mounted in an acoustically inert MDF (Medium Density Fiberboard) cabinet. The 271 LR speakers are magnetically shielded so they may be placed right next to a TV set without concern.
Model 273m C Center Channel Speaker
It is vital to the accurate reproduction of a multi-channel soundtrack that the three front speakers have the same sonic signature. Therefore, the Model 273m C Center Channel Speaker contains the
same two 5-1/4" IMG woofers and 1" fluid cooled silk dome tweeter as the 271 LR speakers. The 273m C is designed for use only with a dedicated subwoofer like the 272 PBM THX. The 273m C includes a high frequency level control that allows it to be placed directly above or below the TV screen (which impacts the speaker’s sound) and still provide accurate reproduction. Since up to 85% of dialogue and 65% of special effects are reproduced through the center channel speaker, it’s important that its sound be accurate and timbre-matched to the other speakers in the system. The rear-mounted High Frequency control incorporated into the 273m C allows for this matching. Additionally, there are switches to compensate for the speaker’s proximity to a TV screen and to adjust the midrange “presence.”
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Models 271 LR, 273m C, and 274t SR |
Atlantic Technology® |
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The 273m C center speaker is intended to be placed in a horizontal position, as opposed to the vertical positioning intended for the 271 LR. It too is magnetically shielded so it may be placed directly adjacent to your TV set with no adverse effects.
Model 274t SR Surround Speaker
The Model 274t SR Dipole Surround Speaker is intended for use in multi-channel audio/video sound systems only as a dedicated surround channel speaker. Each speaker has two 4-1/2" IMG woofers and two broad dispersion 3/4" silk dome tweeters. The drivers are angled and internally connected in such a way to produce ambience with minimal localization. The 274t SR’s wide bandwidth and unique construction makes it especially suitable for today’s advanced Dolby Digital and DTS applications.
Important Note: There is a dedicated LEFT and RIGHT model 274t SR. This is clearly marked on the back of each speaker. Should you hang them on the wall, using the supplied keyhole adapters, you must turn the speakers over (hanging them “upside down”) and swap them side to side for proper operation.
Please note that the vast majority of the time, surround speakers are called upon to reproduce all the “environmental” sounds that are used as cues to tell you “where you are”. We are firmly convinced that Dipoles are undoubtedly the best and most practical way to create such an involving and believable soundfield at home.
Note: Although the speakers in the Atlantic Technology System 270 THX are acoustically and cosmetically matched to each other for best results, they may also be used with other Atlantic Technology components and a wide variety of speakers from other manufacturers with satisfying results.
Connecting Your System
We recommend that you connect your System 270 THX with high quality dual conductor stranded wire of 18 gauge or larger, for lengths up to 15 feet. (Remember, the lower the gauge number, the larger the wire). Use 16 gauge dual conductor or larger for longer runs of wire. Contact your audio/video dealer for specific cable recommendations and further information for special circumstances.
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. We recommend that you check your local electrical codes to make sure that you’re not using an improper connector.
You can connect your System 270THX speakers by using a variety of audio connectors such as banana plugs (single or double—North America only), pin connectors, spade lugs, etc., or you can:
1.Remove 1/2" of insulation from each wire end.
2.Twist the stranded wire together, keeping the two ends separate.
3.Place the appropriate wire through the appropriate postholes in the connectors. These holes are revealed when you loosen the connector capscrew.
4.Screw down the capscrew tightly, but be careful not to overtighten.
5.Check the capscrews 24 hours after hookup and occasionally after that, as they can loosen over time.
Figure 1: |
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It’s important to observe polarity while making speaker connections: red (+) |
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Gold plated |
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terminals on the amplifier to red (+) on the speaker, black (-) on the amplifier to |
5-way binding |
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black (-) on the speaker. Look carefully at the wires you are using and note that |
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posts. Accepts |
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one of conductors of each pair will be identified by color, printing on the outer |
up to 10 gauge |
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jacket, ridges on the outer jacket, or a thread intertwined with the wire strands. By |
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bare wire. |
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convention, the marked wire is connected to the red (+) terminal. |
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