JL Audio 12TW3 -D4

The  12TW3 -D4 from JL Audio is a 12-inch (30cm) subwoofer in a class of its own. Quality and performance come together in this specially designed subwoofer, which is known for a powerful combination of low installation depth and high excursion. With innovative technology based on the TW5 Thin-Line subwoofer, the 12TW3 -D4 a remarkable performance and deflection, which even theW3 v3 subwoofer. Designed for small enclosures, it offers optimal sound quality in a small space requirement. Also note its special features such as the low installation depth, the long linear excursion and the DMA-optimized motor design. Another eye-catcher is the aluminum rear cover and dust cap with the JL Audio logo.

• Building on the core technology of JL's TW5 Thin-Line subwoofers, the TW3 a powerful combination of low installation depth and high deflection. They are even able to achieve greater deflections than theW3 v3 subwoofer.
• To enable this remarkable performance, JL Audio's patented Thin-Line woofer technology compresses the architecture of the TW3 by a "Concentric Tube" structure built into the injection-molded cone body. This structure supports the voice coil and a full-ring spider while allowing the large motor structure to be placed further forward in the speaker than in conventional designs.
• The TW3 are optimized for small packages and feature JL's tab mounting design to maximize the cone area within their mounting surface. 
• Very low installation depth (3.50 inches)
• Very small requirements for the volume of the sealed housing
• Very long linear displacement (0.60 In / 15.2 mm, one-way linear displacement)
• DMA-optimized engine designs
• cast alloy frame
• Membrane made of injection-molded, mica-filled polypropylene
• rubber surround
• Aluminum alloy dust cap and rear cover with JL Audio logo
• Precision engineered in the USA at the JL Audio factory in Miramar, Florida, using global components
• SGR-12TW3 grille optional

• Continuous power handling (RMS): 400 W
  
• Recommended amplifier power (RMS): 200 - 400 W
  
• Nominal impedance (Znom): Dual 4 Ω

• Nominal diameter: 12 inches / 300 mm
  
• Total diameter (A): A1: 335 mm / 13.2 inches
  
• Minimum diameter A2 : 318 mm / 12.5 inches
  
• Installation diameter (B) : 295 mm / 11.625 inches
  
• Bolt circle diameter (C): 318 mm / 12.5 inches
  
• Motor outer diameter (D): 156 mm / 6.125 inches
  
• Installation depth (E): 89 mm (3.5 inches)
  
• Volume displacement: 0.029 cu ft / 0.82 L
  
• Net weight: 14.9 lb / 6.8 kg

• Free Air Resonance Frequency (Fs): 26.46 Hz
  
• Electrical "Q" (Qes) : 0.558
  
• Mechanical "Q" (Qms) : 10,766
  
• Total quality "Q" (Qts) : 0.531
  
• Equivalent Volume (Vas): 1.72 cu ft / 48.73 L
  
• One-way linear displacement (Xmax): 0.6 inches / 15.2 mm
• Efficiency (1 W / 1 m): 84.11 dB SPL
  
• Membrane area (Sd) : 0.0539 square meters
  
• DC resistance (Re): 9.280 Ω

• Wall thickness: 19 mm / 0.75 inches
  
• Front baffle thickness: 19 mm / 0.75 inches
  
• Volume (Net Int.): 0.80 cu ft / 22.7 L
  
• Outer width (W) : 540 mm / 21.25 inches
  
• External height (H) : 406 mm (16 inches)
  
• External depth (D) : 6.5 inches / 165 mm
  
• F3 : 37.99 Hz
  
• Fc : 46.97 Hz
  
• Qtc: 0.9426

• Wall thickness: 19 mm / 0.75 inches
  
• Front baffle thickness: 19 mm / 0.75 inches
  
• Volume (Net Int.): 0.95 cu ft / 26.9 L
  
• Outer width (W): 762 mm (30 inches)
  
• External height (H) : 422 mm / 16.625 inches
  
• External depth (D) : 6.50 inches / 165 mm
  
• Internal slot connection width (SW): 127 mm / 5 inches
  
• Internal slot clearance height (SH): 64 mm / 2.50 inches
  
• Internal slot connection length (SL): 794 mm (31.25 inches)
  
• Length of port extension (EL): 660 mm / 26 inches
  
• Tuning frequency (Fb): 32.14 Hz
  
• F3 : 32.52 Hz