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Model 224, 334 and 444 SB Powered Subwoofer
CAUTION: To reduce the risk of electric shock, do not remove the
cover (or back). No user serviceable parts inside. Refer to qualified per-
sonnel.
WARNING: To reduce the risk of fire or electric shock, do not expose
this appliance to rain or moisture. This device generates a fair amount of
heat. Make sure nothing blocks the ventilation openings on the top and
bottom of the unit.
The lightning flash with arrowhead, with in an equilateral
triangle, is intended to alert the user to the presence of
uninsu lated “dangerous voltage” within the product’s
enclosure that may be of sufficient magnitude to con-
stitute a risk of electrical shock to persons.
The exclamation point within an equilateral triangle is
intended to alert the user to the presence of important
operating maintenance (servicing) instructions in the
literature accompanying the appliance.
For Future Reference
Record your serial numbers and date of purchase here:
Model Number
Serial Number
Date of Purchase
The serial number is found on the back panel.
Table of Contents
Safety Precautions
Safety Precautions
2 Model 224, 334 and 444 SB
3 224, 334 and 444 SB Subwoofer Rear Panel
4 Clear Filter™ Technology and Other Features
5 Connecting Your Subwoofer
5 Subwoofer Line Out to Low Level In
5 Using the Low Level Output
5 Power Connection
6 Low Level Connections with One Subout/LFE Output
7 Low Level Connections with Two Subout/LFE Outputs
8 Placement and Operation
8 System Setup
8 Subwoofer Tuning Without an SPL Meter or Test Tones
8 How Much is Enough?
9 Dual Subwoofer Placement
9 Using the Subwoofer Crossover Control
9 The Phase Invert Control
9 A Word About Bass, Center Channel Modes
and System Set Up
9 Care of Your Subwoofer
10 Subwoofer Troubleshooting Guide
10 Specifications
Copyright © 2009 Atlantic Technology International.
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. THX and THX Ultra 2
are registered trademarks of Lucasfilm, Ltd. Dolby Digital, AC-3, Dolby Stereo and Dolby
Pro Logic are trademarks of Dolby Laboratories Licensing Corporation.
Model 224, 334 and 444 SB
High Performance Powered Subwoofers
Congratulations on your purchase of an Atlantic Technology powered
subwoofer. A well designed subwoofer, properly integrated into your sys-
tem, will enhance your listening pleasure dramatically by providing the
bass foundation upon which most music and special effects are built.
These subwoofers are capable of delivering very high output levels and
wide dynamic range. When properly placed, these subs will provide
smooth in-room bass response down to approximately 25Hz, with a peak
SPL of over 102dB in a normal sized room.
Their high-current amplifiers, coupled with their rugged long-throw
woofers in sealed enclosures, generate accurate deep bass with a mini-
mum of distortion.
Your Atlantic Technology powered subwoofer will smoothly integrate
with virtually all brands of loudspeakers on the market. From the rock-
solid amplifier to the easily accessible controls, this is one of the most
versatile high performance subwoofers you can buy.