Atlantic Technology 454 SR Manuale di istruzioni - Pagina 6

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Models 451 LR, 453 C, and 454 SR

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

Figure 4:

Boundary

Compensation

Control on rear

panel of 453 C.

Conversely, if there doesn't seem to be enough midrange frequencies, if voices sound muffled for

example, rotate the boundary compensation control clockwise to increase these frequencies.

For free-air use, and to meet THX specifications, keep the switch next to the boundary compensation

control in the THX position. The variable control will have no effect when this switch is in the

THX position.

The Model 454 SR Surround Speakers should be placed at the sides of the room with the null

(the point of the triangle between the two sets of drivers) of the speakers aimed at the listening

position. Height of the surrounds should be between ear level and two feet above ear level. If there is

more than one row of seats, the surround speakers should be at the sides of the room at the

geometrical center of the seating positions. Some people prefer to have the surround speakers mounted

high up on the side walls, slightly behind the listening position. In this case mount the speakers

upside-down to position the tweeters at the bottom of the cabinet. This will acoustically position the

speaker lower on the wall. This mounting position can provide a larger sense of "space" and may be

the only choice in some rooms.

The Model 452 PBM Powered Subwoofer should be placed in the front of the room, close to a

corner. Every room has its own unique sound, and flexibility in the exact placement of the subwoofer

is always desirable. In general, the closer the woofer is placed to a corner, the more bass response you

will hear. However, in many rooms, corner placement can produce too much bass and the subwoofer

will work best well away from the corner. Experiment to find the best position in your room. Refer to

the wiring diagrams in the subwoofer's owner's manual for the correct wiring scheme for your

particular setup. Then proceed with listening.

Subwoofer Tuning

Start your listening with the high-pass filter set at 80Hz, the phase switch set to normal, and the

level control all the way down (counterclockwise). Play some music that you know has good bass

content, and turn the level control up until you just start to hear the subwoofer working. Now, from

your normal listening position, determine whether the subwoofer is playing loud enough and filling in

the bass frequencies of the music evenly. If it needs adjustment, change the setting of the level control

to compensate.

midrange response from the sound reflecting off of the TV

screen. This can often result in harsh midrange and treble

response and a blurring of the sound when you are sitting off

to the side.

Once you have the speaker in position, put on some music or

a movie with good center channel information. Sit down and

listen for a few minutes. If you find the midrange response

exaggerated, rotate the boundary compensation control

counterclockwise with the switch in the variable midrange

position. This will reduce the level of midrange frequencies.

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