Rockford Fosgate P2D2-8

• Sensitivity (1W, 1m, infinite baffle) SPL1W 83.1dB

Thiele & Small parameters

• Resonance frequency (free air) fS 39.6Hz
• Mechanical quality factor QMS 5.40
• Electrical quality factor QES 0.51
• Total quality factor QTS 0.46

Large signal parameters

• Maximum linear excursion xmax 7.8mm
• Air volume displaced at xmax VD 172cm³
• Power handling P 250W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 3.4Ω
• Inductance (1kHz, in series) LE 2.9mH
• VC Diameter 57mm

Magnet

• Force factor (in series) Bl 13.7N/A
• Motor constant Bl/√RE 7.43N/√W
• Weight 1.39kg

Diaphragm

• Effective diameter 168mm
• Effective area SD 221cm²
• Moving mass MMS 113g
• Moving mass (without air load) MMD 111g

Suspensions

• Stiffness KMS 6.99N/mm
• Compliance CMS 143µm/N
• Equivalent volume to the compliance VAS 9.9L
• Mechanical resistance RMS 5.21N·s/m

Dimensions

• Nominal diameter 8″
• 203mm
• Baffle cutout diameter 181mm
• Mounting depth 121mm
• Volume occupied by the driver 1.19L