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Atlantic Technology
®
● A useful in room working frequency range of 20Hz to 150Hz
● A unique Dual Diversity Crossover
TM
(DDC) system with an adjustable (50Hz to 150Hz) 12dB
per octave low-pass crossover, and a fixed 24dB per octave “voice filter” at 180Hz.
This sophisticated crossover’s upper end roll-off slope is an extremely steep 12dB + 24dB per
octave, totaling 36dB per octave above 180Hz. 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 to allow this subwoofer to match well with compact home theater
speaker systems. If you are using a subwoofer with extremely small satellites which have limited
mid-bass output you’ll need to cross over the subwoofer at a fairly high frequency. Since very
compact Left / Right / Center speakers typically aren’t capable of delivering significant output
below 100 to 125Hz, 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 get correct system integration. This is because higher frequencies are your ears’ clues to
where sound comes from. The innovative DDC 36dB crossover in the 172 PBM ensures precise
and seamless system integration with compact satellite speakers. A subsonic filter is also
incorporated to eliminate inaudible ultra-low frequencies that can rob amplifier power.
Figure 1:
Amplifier panel
and controls for
Model 172 PBM