JL AUDIO 12TW3-D4

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

Physical Specifications

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Nominal Diameter12 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 Displacement0.029 cu ft / 0.82 L
Net Weight14.9 lb / 6.8 kg

Parameters

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 Enclosure Specifications

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Wall Thickness0.75 in / 19 mm
Front Baffle Thickness0.75 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
F337.99 Hz
Fc46.97 Hz
Qtc0.9426

Enclosure Notes
* The enclosure recommendations listed above are external dimensions which assume the use of 0.75 in (19 mm) thick material. If you are using 0.625 in (16 mm) thick material, subtract 0.25 in (6) from each dimension. Do not use any material with a thickness of less than 0.625 in (16 mm) as this may compromise the rigidity of the enclosure.
* All enclosure volumes listed above are net internal volumes! Driver displacement, port displacement and brace displacement must be added to obtain the final gross internal volume. All enclosure dimensions above have already taken this into account.
* When using multiple subwoofers in a common enclosure you will need to recalculate the enclosure and port dimensions. For assistance please contact your authorized JL Audio dealer or JL Audio Technical Support.
* We recommend the use of this speaker in a bi-amplified system using high-quality satellite speakers and a high-quality amplifier. We do not recommend the use of this subwoofer with a passive crossover (coil), as this type of device will adversely affect performance. 
* All specifications are subject to change without notice.

Ported Enclosure Specifications

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Wall Thickness0.75 in / 19 mm
Front Baffle Thickness0.75 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