JL Audio 12TW1-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.2dB

Thiele & Small parameters

• Resonance frequency (free air) fS 32.4Hz
• Mechanical quality factor QMS 11.07
• Electrical quality factor QES 0.56
• Total quality factor QTS 0.53

Large signal parameters

• Maximum linear excursion xmax 10mm
• Air volume displaced at xmax VD 436cm³
• Power handling P 300W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.5Ω
• Inductance (1kHz, estimated) LE 2.59mH

Magnet

• Force factor Bl 15.8N/A
• Motor constant Bl/√RE 8.43N/√W
• Diameter 145mm

Diaphragm

• Effective diameter 236mm
• Effective area SD 436cm²
• Moving mass MMS 194g
• Moving mass (without air load) MMD 187g

Suspensions

• Stiffness KMS 8N/mm
• Compliance CMS 125µm/N
• Equivalent volume to the compliance VAS 33.7L
• Mechanical resistance RMS 3.56N·s/m

Dimensions

• Nominal diameter 12″
• 300mm
• Overall diameter 314mm
• Baffle cutout diameter 281mm
• Overall depth 139mm
• Flange thickness 22mm
• Mounting depth 117mm
• Volume occupied by the driver 2.04L
• Net weight 7.5kg