Rockford Fosgate P3D4-15

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.4dB

Thiele & Small parameters

• Resonance frequency (free air) fS 22.4Hz
• Mechanical quality factor QMS 4.90
• Electrical quality factor QES 0.64
• Total quality factor QTS 0.57

Large signal parameters

• Maximum linear excursion xmax 15.9mm
• Air volume displaced at xmax VD 1422cm³
• 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 6.45mH
• VC Diameter 64mm

Magnet

• Force factor (in series) Bl 22.8N/A
• Motor constant Bl/√RE 9.01N/√W
• Weight 2.72kg

Diaphragm

• Effective diameter 337mm
• Effective area SD 894cm²
• Moving mass MMS 369g
• Moving mass (without air load) MMD 351g

Suspensions

• Stiffness KMS 7.3N/mm
• Compliance CMS 137µm/N
• Equivalent volume to the compliance VAS 156L
• Mechanical resistance RMS 10.6N·s/m

Dimensions

• Nominal diameter 15″
• 381mm
• Baffle cutout diameter 353mm
• Mounting depth 193mm
• Volume occupied by the driver 4.19L