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Fathom® Drivers
You won't find an off-the-shelf woofer in any JL Audio home subwoofer because designing and building superior subwoofer drivers lies at the core of our passion for audio.
For the last decade, JL Audio has been at the forefront
of research into fundamental loudspeaker behavior.
The company has developed proprietary electromagnetic
and suspension analysis systems and invested heavily in state-of-the-art testing and manufacturing systems. JL Audio's intense focus on research has borne subwoofer driver designs widely considered as reference standards for linear displacement and dynamic stability. It has also resulted in numerous U.S. and International Patents issued for technologies that refine and extend the performance envelope of the dynamic driver.
JL Audio's experience with long excursion woofers is a perfect foil to the intense low frequency demands of home theater program material. The drivers used in Gotham® and Fathom® offer a performance envelope so vast, that we can deliver exceptional output without resorting to aggressive electronic limiting or compression.
Driver Technologies:
DMA-Optimized Motor System
DMA is JL Audio's proprietary Dynamic Motor Analysis system aimed at improving dynamic motor behavior. As a result of DMA optimization, our loudspeaker's motor systems remain linear in force over an extreme range of excursion while maintaining a highly stable fixed magnetic field over a wide power range. This leads to vastly reduced distortion and accurate transient performance... or put simply: tight, clean, articulate bass.
OverRoll Surround
(U.S. Patent #5,687,247 and #5,949,898)
The OverRoll surround spans over the driver's mounting flange, utilizing available diameter wasted in conventional speakers. This allows the use of the wider roll necessary to control high-excursions without sacrificing precious cone area.
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W-Cone
(U.S. Patent #6,496,590)
The W-Cone is a unit-body cone assembly that delivers astonishing cone stiffness with minimal mass. The shape also provides incredible torsional rigidity, which is critical to maintaining voice coil alignment at the suspension limits.
Floating-Cone Attach Method
(U.S. Patent #6,501,844)
This assembly technique ensures proper surround geometry in the assembled speaker for better excursion control and dynamic voice coil alignment.
Plateau-Reinforced Spider Attachment
(U.S. Patent #6,118,884)
A derivative of JL Audio's VRC technology, this bulletproof suspension attachment relieves stress from the spider material at high-excursions for enhanced reliability.
Elevated Frame Cooling Technology
(U.S. Patent #6,219,431 and #6,229,902)
This feature delivers cool air through slots directly above the top-plate to the voice coil of the speaker. This not only enhances power handling, but also sound quality by minimizing dynamic parameter shifts and power compression.
Radially Cross-Drilled Pole Piece
(U.S. Patent #6,243,479)
This innovative venting system greatly enhances thermal dissipation and power handling by directing air flow onto the voice coil former, working in conjunction with the Elevated Frame technology.
In addition to the patented technologies listed above, multiple U.S. and International patents are currently pending.
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