System 450 THX Reference THX Home Theater Loudspeaker System Covers Models 451 LR, 453 C, and 454 SR 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 Instruction Manual ®
Atlantic Technology Models 451 LR, 453 C, and 454 SR ® SYSTEM 450 THX Reference THX Home Theater Loudspeaker System Congratulations on your purchase of the Atlantic Technology System 450 THX loudspeaker system. With proper care, your new speaker system will provide many years of trouble-free, high quality sound reproduction. The System 450 THX was designed to provide accurate, uncompromised reproduction of high fidelity music and movie soundtracks.
Atlantic Technology Models 451 LR, 453 C, and 454 SR ® 452 PBM Subwoofer ■ ■ High output level reproduces full dynamic impact (110dB). Smooth in-room response down to 20Hz. A Word About Digital Surround Technologies and THX It is important to remember that THX technologies work in conjunction with whatever processing technology it is paired. THX, on its own, is not a decoder or processor.
Atlantic Technology Models 451 LR, 453 C, and 454 SR Figure 2: Typical wiring diagram for speakers in a home THX theater. ® To optional second subwoofer Finally, check the polarity of your front speakers by listening to some music. If the sound seems hollow, indistinct, and has weak bass, one of your speakers is out of phase. Recheck your connections for proper polarity and reverse the connections if necessary.
Atlantic Technology Models 451 LR, 453 C, and 454 SR ® you get a good stereo image, but not so far apart that the sound seems distant and distracting. Avoid placing the speakers too close to a corner or too close to the TV, and try to maintain an equal distance from the screen on both sides. Ideally, the acoustic center of the speaker (the tweeter) should be within two feet of ear level when you are in a seated position. Figure 3: Typical arrangement for speakers in a THX home theater.
Atlantic Technology Models 451 LR, 453 C, and 454 SR Figure 4: Boundary Compensation Control on rear panel of 453 C. ® The Boundary Compensation Control on the rear panel of the 453 C provides a unique way to fine-tune the frequency balance of the speaker when it is placed on or near a reflective surface. In many situations, the unfortunate audible result of placing a speaker on top of a TV is a boost in the midrange response from the sound reflecting off of the TV screen.
Atlantic Technology Models 451 LR, 453 C, and 454 SR ® If the bass seems too heavy, move the subwoofer away from the corner. If the bass seems too thin, move the subwoofer closer to the corner. Small differences in positioning the subwoofer can make big differences in the overall bass response. When you find a position that seems to work well, try switching the phase switch between its two settings, listening closely for the smoothest bass response.
System 450 THX Specifications Model 451 LR 453 C 454 SR Type Sealed-box, 3-way D’Appolito Sealed-box, 3-way, D’Appolito Sealed-box, TwinPolar™ (V-pole) spatially-enhanced Drivers (2) 6-1/2" IMG woofer; (2) 3-1/2" IMG midrange driver; (1) 1" silk dome tweeter, neodymium magnet, ferrofluid cooled (2) 6-1/2" IMG woofer; (2) 3-1/2" IMG midrange driver; (1) 1" silk dome tweeter, neodymium magnet, ferrofluid cooled (2) 5-1/4" IMG woofer; (2) 3/4" silk dome tweeter, neodymium magnet, ferrofluid cooled
