Thin-Line Design: JL Audio's patented thin-line woofer
technology compresses the architecture of the 12TW3-D4 subwoofer and allows
it to deliver great bass performance in tight space applications (less than
3-1/2" deep). Central to the technology is the Concentric Tube structure
that supports the oversized voice coil and the suspension attachments. This
permits placing the motor structure much further forward in the speaker than
conventional designs, while maintaining excellent linear excursion capability.
Equally important, the 12TW3-D4 is designed for extremely small enclosure
applications; 0.8 ft³ is optimum.
Concentric Tube Suspension: JL Audio's patented Concentric
Tube Suspension employs a molded structure which spans beyond the edge of the
motor structure, supporting the spider on the outside of the motor's boundaries
and the large diameter voice coil on the inside. The large voice coil permits
the magnet to sit inside it, rather than surrounding the coil as is typical in
most woofers. The concentric tube structure and the elimination of a conventional
top-plate helps JL Audio place the motor higher up into the cone body's space to
further compress depth, while still permitting excellent mechanical excursion.
Mica-Filled Polypropylene Woofer: The subwoofer features an
injection-molded, mica-filled polypropylene cone woofer with a rubber surround
for added durability, woofer excursion and bass response.
Dynamic Motor Analysis (DMA): DMA is JL Audio's proprietary
method of improving dynamic motor behavior. As a result of DMA optimization, the
12TW3-D4 motor remains linear over a long excursion range, and also maintains a
stable fixed magnetic field in the gap over a wide power range. The result is
reduced distortion, faithfully reproduced transients, and tight, clean, articulate
Floating Cone Attachment Method (FCAM): JL Audio's patented
FCAM technology is an innovative method of bonding the surround/cone assembly to
the voice coil/spider assembly. This assembly technique ensures proper surround
geometry in the assembled speaker for better excursion control and dynamic voice
Recommended Sealed Box Volume: The sealed box size recommended
by JL Audio is 0.8 ft³. A diagram is provided in the owner's manual for a sealed
box with external dimensions of 21-1/4" W x 16" H x 6-1/2" D, assuming
3/4" thick material. (If you are using 5/8" thick materials, subtract
1/4" from each dimension.)
Shallow Mount Design: The JL Audio 12TW3-D4 requires a mounting
depth of less than 3-1/2".
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