JL Audio 12TW3-D4 Shallow-mount 12″ 400 Watt Subwoofer With Dual 4 Ohm – #92185


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JL Audio 12TW3-D4 #92185 Shallow-mount 12-inch Subwoofer With Dual 4-ohm

  • 12″ subwoofer with dual 4-ohm voice coils
  • Shallow-mount design with small airspace requirements
  • Mica-filled polypropylene cone with rubber surround
  • Cast alloy basket
  • Top-mount depth: 3-1/2″
  • Power range: 100-400 watts RMS
  • Peak power handling: 800 watts
  • Frequency response: 22-200 Hz
  • Sensitivity: 82.1 dB
  • Sealed box volume: 0.75 cubic feet

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Frequently Bought Together

JL Audio 12TW3-D4+JL Audio C5-570+
Price for all three:   $1,449.17

Product Description

JL Audio 12TW3-D4 #92185 Shallow-mount 12-inch Subwoofer With Dual 4-ohm

If you’ve got a pickup truck, sports car, or you just need to haul a lot of stuff, then you know that adding some bass can be a challenge. That’s why JL Audio built the JL Audio 12TW3-D4 shallow-mount subwoofer. This super-thin 12″ sub puts out big bass, yet only requires minimum air space, so you can use a much smaller enclosure. Now, you can have your bass and your space too.

JL Audio’s amazing engineering

JL Audio used all their tricks to build a sub this slender without giving up performance. The JL Audio 12TW3-D4 tough polypropylene cone won’t flex under high power, and the large, durable rubber surround helps the cone move large amounts of air. The heavy-duty cast-alloy frame only stands 3-1/2″ tall, but provides a stable home for this high-performance bass driver. For best results, you’ll want to send this sub up to 400 watts RMS, and its dual 4-ohm voice coils make it a perfect match for a mono amplifier.

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 12TW3-D4 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 JL Audio 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 bass.

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 coil alignment.


Additional Information

Car Subwoofer Size


General Specifications

Continuous Power Handling (RMS) – 400 W
Recommended Amplifier Power (RMS) – 200 – 400 W
Nominal Impedance (Znom) – Dual 4 Ω

Physical Specifications

Nominal Diameter – 12 in / 300 mm
Overall Diameter (A) – A1: 13.2 in / 335 mm
A2: – 12.5 in / 318 mm
Mounting Hole Diameter (B) – 11.625 in / 295 mm
Bolt Hole Circle Diameter (C) – 12.5 in / 318 mm
Motor Outer Diameter (D) – 6.125 in / 156 mm
Mounting Depth (E) – 3.5 in / 89 mm
Driver Displacement – 0.029 cu ft / 0.82 L
Net Weight – 14.9 lb / 6.8 kg


Free Air Resonance (Fs) – 26.46 Hz
Electrical “Q” (Qes) – 0.558
Mechanical “Q” (Qms) – 10.766
Total Speaker “Q” (Qts) – 0.531
Equivalent Compliance (Vas) – 1.72 cu ft / 48.73 L
One-Way Linear Excursion (Xmax)* – 0.6 in / 15.2 mm
Efficiency (1 W / 1 m)** – 84.11 dB SPL
Effective Piston Area (Sd) – 83.517 sq in / 0.0539 sq m
DC Resistance (Re)*** – 9.280 Ω

* Xmax specifications are derived via one-way voice coil overhang method with no correction factors applied.
** For parallel-wired voice coils, divide “Re” by 4. All other specifications remain the same.
*** Re (DC resistance) is measured with the voice coils in series, for parallel-wired specification divide Re by 4. All other specifications remain the same.

Sealed EnclousureSpecifications

Wall Thickness – 0.75 in / 19 mm
Front Baffle Thickness – 0.75 in / 19 mm
Volume (net int.) – 0.80 cu ft / 22.7 L
External Width (W) – 21.25 in / 540 mm
External Height (H) – 16 in / 406 mm
External Depth (D) – 6.5 in / 165 mm
F3 – 37.99 Hz
Fc – 46.97 Hz
Qtc – 0.9426

Ported Enclousure Specifications

Wall Thickness – 0.75 in / 19 mm
Front Baffle Thickness – 0.75 in / 19 mm
Volume (net int.) – 0.95 cu ft / 26.9 L
External Width (W) – 30 in / 762 mm
External Height (H) – 16.625 in / 422 mm
External Depth (D) – 6.50 in / 165 mm
Internal Slot Port Width (SW) – 5 in / 127 mm
Internal Slot Port Height (SH) – 2.50 in / 64 mm
Internal Slot Port Length (SL) – 31.25 in / 794 mm
Port Extension Length (EL) – 26 in / 660 mm
Tuning Frequency (Fb) – 32.14 Hz
F3 – 32.52 Hz

RMS Power

201 to 400 Watts

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