Thin-Line Design: The patented thin-line woofer technology
compresses the architecture of the JL Audio 13TW5v2-4 subwoofer and allows it
to deliver great bass performance in tight space applications, requiring only
2-5/8" depth. 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
in conventional designs, while maintaining excellent linear excursion capability.
Equally important, the design is optimized for extremely small box volume
Concentric Tube Suspension: A challenge in any low-profile
woofer design is to permit enough mechanical clearance for the speaker to handle
power and generate good output at low frequencies. JL Audio's patented solution
employs a molded structure which spans over the edge of the motor system,
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 move the motor structure into the cone body's space to further
compress depth, while still permitting substantial mechanical excursion.
Dynamic Motor Analysis (DMA): DMA is JL Audio's proprietary
method of improving dynamic motor behavior. As a result of DMA optimization, the
13TW5v2-4 motor maintains a linear force over a long excursion range and stable,
fixed magnetic field in the gap over a wide power range. The result is reduced
distortion, faithfully reproduced transients, and tight, clean, articulate bass.
Floating Cone Attachment Method (FCAM): JL Audio's patented
FCAM technology is a method of attaching the surround/cone assembly to the voice
coil/spider assembly to maintain proper surround geometry, thus improving excursion
control and dynamic voice coil alignment.
Voice Coil: To counteract the efficiency tradeoff of small
box volume, the 13TW5v2-4 is designed to handle very high power levels thanks to
the use of a very large 7-inch diameter voice coil.
Recommended Sealed Box Volume: JL Audio recommends a sealed
box size volume of 0.8 ft³, resulting in a -3dB point of 41.42 Hz. A diagram is
provided in the owner's manual for a sealed box with external dimensions of
19" W x 15" H x 7.75" D, assuming 3/4" thick MDF. (If using
5/8" thick MDF, subtract 1/4" from each dimension.)
Shallow Mount Design: The JL Audio 13TW5v2-4 only requires a
mounting depth of 2-5/8" (top mounted).
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