Atlantic Technology 452 PBM THX Manuel utilisateur

Model 452 PBM THX®Reference THX

Powered Subwoofer System

Instruction Manual

Atlantic Technology

NNOVATIVE

OME

HEATER

343 Vanderbilt Avenue Norwood, MA 02062 (781) 762-6300

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Model 452 PBM THX

Atlantic Technology

ODEL

452 PBM THX

Reference THX Powered Subwoofer System

Congratulations on your purchase of an Atlantic Technology 452 PBM THX powered subwoofer. With

proper care, your new subwoofer will provide many years of trouble-free, high quality reproduction.

The 452 PBM is fully THX certified to provide very high output levels and a wide dynamic range with

smooth in-room response down to 20 Hz, with a peak SPL of 110 dB.

The subwoofer also features a proprietary class G linear amplifier conservatively rated at 325 watts rms.

This amplifier, coupled with a massive 15" high-excursion woofer will deliver very high output levels

with minimum distortion.

Your Atlantic Technology powered subwoofer will easily integrate with virtually all other brands of

loudspeakers on the market. All inputs and outputs, both line level and high (speaker) level, are

designed for optimum signal integrity. The premium quality gold plated connectors and all controls

are clearly labeled and versatile in operation. The amplifier has more than ample power and headroom

to supply a high fidelity foundation to any audio or home theater system.

Lucasfilm Home THX

George Lucas and Lucasfilm, creators of the Star Wars saga, originated and perfected Home THX, a

strict set of standards and guidelines for home theaters, enabling you to reproduce the full sound

heard in the finest theaters in your home. When properly followed, these guidelines address and

correct the problems encountered when a film soundtrack is played

back in the smaller environment of the home. The Home THX system

takes a soundtrack that was mixed and equalized to play back in a

large theater and adapts it to reproduce more naturally when

experienced in the smaller space of your home.

It is important to realize that THX is not a recording process or a

special decoding system. All motion pictures will be reproduced as

they were heard in the film studio dubbing stage through the Home

THX system, no matter what surround decoding system is used. Whether you are using Dolby Digital

(AC-3), DTS, Dolby Pro Logic, or any other system, Home THX will make the experience more natural

and lifelike. With the lights down, your intimate home theater environment is transformed into the

large acoustic space of a real theater. It’s really quite startling how “big” your room will sound when

the lights are off and the visual cues of your room size are absent.

Features

Your Atlantic Technology 452 PBM THX powered subwoofer was engineered using the latest

technology and finest components available.

●High excursion 15" driver in a sealed acoustic suspension cabinet

●Class “G” linear power amplifier conservatively rated at 325 watts RMS

●Discrete, high current output devices

●Working frequency range from 20 Hz to full bypass, (approximately 500 Hz)

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Model 452 PBM THX

Atlantic Technology

●Adjustable low-pass filter from 55 Hz to full bypass

The slope of this low-pass filter is 18 dB/octave. This allows for flexible integration with most any

brand or type of speaker on the market. A subsonic filter is also incorporated to filter out

inaudible frequencies that can rob amplifier power.

●Two line inputs, two line thruputs, and an 80 Hz line level high-pass output

The thruputs allow daisy-chaining of multiple subwoofers, or can act as a return path back to the

processor. The high-pass outputs send the audio signal, minus the bass frequencies below 80Hz,

back to your amplifier and main speakers.

●Phase inverter toggle switch (0/180 degrees)

Allows matching with many systems whose output may be inverse phased.

●Front panel variable volume control with THX preset position

●Automatic standby operation

The 7-10 minute turn-off delay features a front panel indicator and a defeat switch.

●IEC AC power socket

Unit comes supplied with a detachable power cord.

●Heavy duty rocker type power switch

●Design and construction meets all UL/CSA European safety requirements

Connection

The Atlantic Technology 452 PBM THX Powered Subwoofer is simple to hook up, offering several

connection methods for maximum flexibility. Study the system diagrams starting on page 5. Once

you have found the example which most closely matches your system, hook up your subwoofer(s)

as shown in that diagram.

Low-Level Connection

For simplicity, we suggest using the low-level (RCA style jacks) subwoofer line out or preamp outputs if

your receiver/amplifier has them. Simply connect your subwoofer with high quality shielded cables as

shown in the diagrams.

High-Level Connection

Alternately, you may use the high-level (speaker) inputs. Make sure to match the type and gauge

speaker wire used to connect your main speakers.

We recommend that you connect your new 452 PBM THX Powered Subwoofer(s) using high quality

wire of 16 gauge or larger. There are many respected manufacturers in the audio industry that

specialize in speaker wire and interconnect cables suitable for your new system. We recommend that

you consult your local audio/video specialist for more specific information.

Warning: To prevent risk of electrical shock or damage to your equipment, always unplug all component AC

cords before proceeding with speaker and component connections! The last step in wiring your system is

plugging in the AC cords!

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Model 452 PBM THX

Atlantic Technology

Figure 1:

Amplifier panel and

controls for Model

452 PBM THX

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Model 452 PBM THX

Atlantic Technology

Example 1:

Subwoofer

Line Out/

Low Level In

This is the most

commonly used

system

connection for

systems with

surround sound

receivers/

processors.

Example 2:

Preamp Line

Out/Low

Level In for

1 Subwoofer

This arrangement

is for owners of

stereo receivers/

amplifiers with

Preamp outputs.

If your receiver/

amplifier uses

jumper links be-

tween the Pre-out

and Main In, then

you must remove

them and use

option 1 or 2. If

your receiver/

amplifier uses a

switch instead of

connectors, then

use option 3.

Option 1

Option 3

Option 2

L/MONO

RIGHT

LOW LEVELHI PASS THRU

OUT IN

L/MONO

RIGHT

LOW LEVELHI PASS THRU

OUT IN

L/MONO

RIGHT

LOW LEVELHI PASS THRU

OUT IN

Single Sub Woofer

Pre Out

Main In

Receiver/Amplifier/Processor

Pre Out

Main In

Pre Out

Main In

LR Internal

Pre Amp

External

Pre Out

Main In

Y-adapters

Sub Woofer Out

Single Sub Woofer Optional Second Sub Woofer

Receiver/Amplifier/Processor

L/MONO

RIGHT

LOW LEVELHI PASS THRU

OUT IN

L/MONO

RIGHT

LOW LEVELHI PASS THRU

OUT IN

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Model 452 PBM THX

Atlantic Technology

Example 3:

Preamp Line

Out/Low Level

In for

2 Subwoofers

Note that the

L/MONO input is

used on both sub-

woofers. Instead

of Y-adapters, you

may also use the

THRU outputs to

connect back to

the Main Inputs as

shown in Option

2 of Example 2.

Pre Out

Main In

Left Sub Woofer Right Sub Woofer

Receiver/Amplifier/Processor

L/MONO

RIGHT

LOW LEVELHI PASS THRU

OUT IN

L/MONO

RIGHT

LOW LEVELHI PASS THRU

OUT IN

Y-adapters

Example 4:

Preamp Line

Out/Low Level

In using Hi-Pass

Out for

1 Subwoofer

The line level Hi-

Pass outputs send

audio signals

above

the Lo-Pass

filter setting to the

main L and R

power amplifier

inputs. This keeps

the low frequen-

cies out of the left

and right front

speakers, allowing

the subwoofers to

reproduce the

bass frequencies.

Note: These outputs are primarily intended for use in a two channel satellite/subwoofer system where the left

and right speakers are small and not designed to reproduce bass. It is also useful when your receiver/

amplifier/processor does not internally incorporate a low pass filter.

Pre Out

Main In

Sub Woofer

Receiver/Amplifier/Processor

L/MONO

RIGHT

LOW LEVEL

SUBWOOFER

LO-PASS HI PASS THRU

OUT

100

55 140

EXT

FILTER

THX

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Model 452 PBM THX

Atlantic Technology

Example 5:

Speaker Out/

High Level In for

1 Subwoofer

This is the most

common method

for connecting a

subwoofer to a

system without a

dedicated sub-

woofer line out or

Preamp outputs.

Left Right

Main Speakers

Sub WooferLeft Front Speaker Right Front Speaker

Receiver/Amplifier

L/MONO

RIGHT

HI LEVEL

INPUT

LOW LEVELHI PASS THRU

OUT IN

Example 6:

Speaker Out/

High Level In for

2 Subwoofers

This is the most

common method

for connecting 2

subwoofers to a

system without a

dedicated sub-

woofer line out or

Preamp outputs.

Note that the

L/MONO High

Level input is used

on both left and

right subwoofers.

Left Right

Main Speakers

Left Sub Woofer Right Sub WooferLeft Front Speaker Right Front Speaker

Receiver/Amplifier

L/MONO

RIGHT

HI LEVEL

INPUT

LOW LEVELHI PASS THRU

OUT IN

L/MONO

RIGHT

HI LEVEL

INPUT

LOW LEVELHI PASS THRU

OUT IN

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Model 452 PBM THX

Atlantic Technology

THX Example:

THX Subwoofer

Out/Low Level In

Option 1 is the

most commonly

used method of

connecting two

subwoofers to a

THX system. You

may also use a Y-

adapter as shown

in Option 2.

Option 1 Option 2

Note: The front panel level control and the rear panel subwoofer lo-pass control must be in the THX position

for proper THX operation.

L/MONO

RIGHT

LOW LEVELHI PASS THRU

OUT IN

L/MONO

RIGHT

LOW LEVELHI PASS THRU

OUT IN

THX

Sub

Woofer

Out

Single Sub Woofer Optional Second Sub Woofer

THX Receiver/Amplifier/Processor

L/MONO

RIGHT

LOW LEVELHI PASS THRUOUT IN

L/MONO

RIGHT

LOW LEVELHI PASS THRUOUT IN

THX

Sub

Woofer

Out

Single Sub Woofer Optional Second Sub Woofer

THX Receiver/Amplifier/Processor

Y-adapter

You can connect your 452 PBM THX by using a variety of 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. We recommend that you check your local electrical codes to make

sure you are not using an improper connector.

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

Power Connection

Connect the power cord to an AC outlet only after making all other connections to the subwoofer.

This will avoid any chance of accidentally activating the subwoofer while wiring. The AC cord should

be plugged into its own wall outlet or into a quality power strip. Avoid using a switched outlet on the

rear panel of another component. The subwoofer can draw more current than these outlets can

provide and performance will suffer. Once the subwoofer is hooked up and the power switch is turned

on, leave it on. The automatic on/off circuitry will only activate the subwoofer in the presence of an

audio signal from your audio/video system. After 7-10 minutes with no signal detected from the rest of

the system, the amplifier will shut itself off and go into standby mode. When an audio signal is

present, the power LED will glow green. Power consumption in the standby mode is negligible.

Figure 2:

Speaker Wiring

Terminals

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Model 452 PBM THX

Atlantic Technology

Changing the Fuse

To change the fuse, remove the power cord, insert a

screwdriver tip into the notch in the side of the fuseholder,

and pry it out. Replace with the correct value fuse and push

back into place. Fuse values are marked adjacent to the IEC

AC socket.

Figure 3:

The fuse is

located next

to the IEC

AC socket

Insert

screwdriver

tip here

Figure 4:

Typical arrange-

ment for a single

subwoofer in a

home theater. Start here

Less Bass

More Bass

Placement and Operation

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

corner (Figure 4). 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 back to the wiring diagrams starting on page 5 for the correct wiring scheme for your

particular setup. Then proceed with listening.

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Model 452 PBM THX

Atlantic Technology

Subwoofer Tuning—Using the Variable Level Control

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

front panel variable level control (Figure 5) set to minimum, just above the Fixed THX clickstop

position. 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

front panel level control to compensate.

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. Remember, the most common error is to play

the subwoofer too loudly.

When two subwoofers are used, whether for Home THX operation, regular Dolby Pro Logic, Dolby

Digital AC-3, or DTS, they should be placed asymmetrically; that is, in slightly different positions on

each side of the television (Figure 6). This will help to attenuate room resonances that are common to

symmetrically positioned subwoofers.

Figure 6:

Assymmetrical

arrangement for

2 subwoofers in

a home theater,

for example, one

closer to a corner

than the other

Figure 5:

Front Panel

Variable Level

Control located

behind the

removable grille

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