Rockford Fosgate P1S8-12

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.4dB

Thiele & Small parameters

• Resonance frequency (free air) fS 25Hz
• Mechanical quality factor QMS 3.10
• Electrical quality factor QES 0.60
• Total quality factor QTS 0.55

Large signal parameters

• Maximum linear excursion xmax 9mm
• Air volume displaced at xmax VD 493cm³
• Power handling P 250W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.2Ω
• Inductance (1kHz) LE 4.11mH
• VC Diameter 51mm

Magnet

• Force factor Bl 17.8N/A
• Motor constant Bl/√RE 7.15N/√W
• Weight 1.28kg

Diaphragm

• Effective diameter 264mm
• Effective area SD 548cm²
• Moving mass MMS 196g
• Moving mass (without air load) MMD 187g

Suspensions

• Stiffness KMS 4.83N/mm
• Compliance CMS 207µm/N
• Equivalent volume to the compliance VAS 88.3L
• Mechanical resistance RMS 9.92N·s/m

Dimensions

• Nominal diameter 12″
• 305mm
• Baffle cutout diameter 285mm
• Mounting depth 152mm
• Volume occupied by the driver 5.1L