Atlantic Technology 172 PBM

Atlantic Technology

●A useful in room working frequency range of 20Hz to 150Hz

●A unique Dual Diversity Crossover

(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