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Atlantic Technology
®
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A useful working frequency range from 30 Hz to 150Hz.
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A Dual Diversity Crossover
TM
(DDC) system with an adjustable (50 Hz to 150 Hz) 12 dB per
octave low-pass crossover, and a fixed 24 dB per octave “voice filter” at 180 Hz.
This unique crossover’s upper end roll-off slope is an extremely steep 12 dB + 24 dB per octave,
totaling 36 dB per octave above 180 Hz. It allows for exceptional integration with most any
brand or type of speaker on the market. We have developed this unusual design to eliminate any
possibility of out-of-band information being audible from the subwoofer and thereby making it
localizable.
The DDC filter is incorporated in the 4.5 PBM because this subwoofer has been design matched
to the Atlantic Technology 4.5 ultra-compact Home Theater speaker system. If you are using the
subwoofer with very small satellites (like the 4.5 L /C/ R units) which have limited mid-bass
output you have to cross over the subwoofer at a fairly high frequency. Since the 4.5 Left / Right
/ Center speakers are specifically designed to eliminate all frequencies below 125 Hz, their mating
subwoofer must reproduce these sounds. However, it’s critically important that all sounds above
this frequency be eliminated from the subwoofer, in order to make for perfect system integration.
This is because higher frequencies are your ears’ clues to where sound comes from. The
innovative DDC 36 dB crossover in the 4.5 PBM ensures precise and seamless system integration
with compact satellite speakers. A subsonic filter is also incorporated to filter out inaudible ultra-
low frequencies that can rob amplifier power.
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Two line inputs, two line thruputs.
The thruputs allow daisy chaining of multiple subwoofers, or can act as a return path back to the
processor.
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Two high level inputs, two high level thruputs.
These let you connect the subwoofer to your amplifier using the amplifier’s speaker outputs.
Once again, you can daisy chain to another subwoofer using the unmodified signal that comes
out of the thruput connectors.
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A phase inversion toggle switch (0/180 degrees).
This switch allows precise acoustic matching with many systems whose output may be phase
reversed. This switch will also allow you to compensate for unusual room acoustics that occur
when the woofer is physically separate from the midrange/high frequency units. Be sure to try the
Phase switch in both positions whenever you set up the 4.5 PBM or when you change the built-in
crossover settings, since the crossover and the Phase switch interact with each other acoustically.
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A front panel variable volume level control.
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Automatic standby operation.
Automatic standby features a 7-10 minute turn-off delay and a front panel multi-color LED status
indicator.
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An IEC AC power input socket.
Your subwoofer comes supplied with a heavy-duty detachable power cord.
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Design and construction to meet all UL/CSA and European safety requirements.
