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The internal airflow of an H-PAS cabinet can be seen below.

(Click the "Play" button below to activate demo. Demo lasts about 10 seconds. Click again to repeat.)

Note the acceleration of the bass wave as it passes through the cabinet before it exits the vent. You can also see the internal bass trap filtering the signal for cleaner sound.

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Introduction to H-PAS Technology

h-pas_logo.gifA cornerstone of Atlantic Technology’s mission is to introduce products embodying innovative technology that serves the needs of its customers. Everything we do is an attempt to markedly improve their acoustic performance, or make them easier to install and use, or increase their value by improving the cost-to-performance ratio.

Every once in a great while, a truly ground-breaking technology comes along that allows us to exceed all of these goals at once.

Our patented H-PAS is that kind of technological breakthrough.

H-PAS stands for Hybrid Pressure Acceleration System. It combines elements of several speaker technologies—acoustic suspension, bass reflex, inverse horn, and transmission line—in an exceptionally unique and innovative fashion to produce bass that absolutely breaks what was previously thought to be the “Iron Law” of loudspeaker acoustics: the notion that you couldn’t have deep bass extension, good system sensitivity, and reasonable enclosure size all in one design. “Pick any two at the expense of the third,” went the old cliché.

That is until now… H-PAS changes everything.

For a more complete technical explanation of how H-PAS works, click the “Description” tab above.

A Completely New — and Better — Way to Generate Bass

at-1_01.jpgH-PAS does not require the use of special drivers, any kind of on-board electronics or outboard equalization -- it is a purely passive system, completely compatible with all AV receivers  and stereo amplifiers.


Employing a unique cabinet design, the elements of the different speaker technologies are cascaded one to another in such a manner as to pressurize and accelerate the very lowest frequency back waves as they travel through the cabinet.

These waves are then radiated into the room through a vent at the lower front of the cabinet. There is an “acoustic crossover” from the vent to the bass drivers and the upper bass and midrange regions are propagated directly from the woofer’s cone.

An important additional feature, integral to the design, is an “acoustic bass trap.” Signals travel through this internal passive resonance/harmonic distortion line filter to further reduce unwanted distortion for clean, tight bass. As a result, the AT-1 delivers extended deep bass with high output levels, and exceptionally low harmonic distortion.

at-1_02.jpgThe central tenet of this new design approach is somewhat counterintuitive. Instead of using heavy, low-resonance drivers to achieve low bass, H-PAS utilizes quick, high-resonance bass drivers. The internal matrix of the cabinet takes the backwave of the driver below its resonance and pressurizes and accelerates it before it exits the vent. This acceleration increases the impact of the highly pressurized air flow in the enclosure when it leaves the vent. The result is both extended low bass and greatly improved dynamic range at such lower frequencies. The internal workings of the cabinet (using very specific, mathematically-derived ratios between the various cabinet/driver relationships) are such that the low frequency efficiency of the system actually increases with decreasing frequency—exactly the opposite of conventional system behavior, where output below resonance drops rapidly. H-PAS produces a reciprocal output of the high-resonance drivers’ natural rolloff, yielding flat acoustic response to well below that of conventional designs using like-sized drivers and cabinets. 

The use of lighter, higher-resonance woofers also means that the AT-1’s H-PAS system exhibits lightning-fast transient response and incredible bass detail compared to the slower high-mass, low-resonance drivers needed to achieve reasonable deep bass extension in ordinary speakers.

In short, H-PAS technology provides greater extended low frequency range, and/or greater output, with increased dynamic range and impact at those extended low frequencies. It can be scaled to fit many size cabinets, small to large. Higher SPL’s are inherent to the design, as is low distortion, which in turn negates any requirement for costly high-power amplification.