Rockford Fosgate P3D4-12

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.6dB

Thiele & Small parameters

• Resonance frequency (free air) fS 27.7Hz
• Mechanical quality factor QMS 5.60
• Electrical quality factor QES 0.57
• Total quality factor QTS 0.52

Large signal parameters

• Maximum linear excursion xmax 15.9mm
• Air volume displaced at xmax VD 906cm³
• Power handling P 600W
• Program power Pmax 1200W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 6.4Ω
• Inductance (1kHz, in series) LE 6.94mH
• VC Diameter 64mm

Magnet

• Force factor (in series) Bl 22.7N/A
• Motor constant Bl/√RE 8.97N/√W
• Weight 2.72kg

Diaphragm

• Effective diameter 269mm
• Effective area SD 570cm²
• Moving mass MMS 264g
• Moving mass (without air load) MMD 255g

Suspensions

• Stiffness KMS 8N/mm
• Compliance CMS 125µm/N
• Equivalent volume to the compliance VAS 57.7L
• Mechanical resistance RMS 8.21N·s/m

Dimensions

• Nominal diameter 12″
• 305mm
• Baffle cutout diameter 285mm
• Mounting depth 169mm
• Volume occupied by the driver 3L