Rockford Fosgate P1S4-8

• Sensitivity (1W, 1m, infinite baffle) SPL1W 84.1dB

Thiele & Small parameters

• Resonance frequency (free air) fS 40Hz
• Mechanical quality factor QMS 4.00
• Electrical quality factor QES 0.48
• Total quality factor QTS 0.47

Large signal parameters

• Maximum linear excursion xmax 8mm
• Air volume displaced at xmax VD 169cm³
• Power handling P 200W
• Program power Pmax 400W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.8Ω
• Inductance (1kHz) LE 2.99mH
• VC Diameter 51mm

Magnet

• Force factor Bl 12.9N/A
• Motor constant Bl/√RE 6.62N/√W
• Weight 1.06kg

Diaphragm

• Effective diameter 164mm
• Effective area SD 211cm²
• Moving mass MMS 83.3g
• Moving mass (without air load) MMD 81.1g

Suspensions

• Stiffness KMS 5.26N/mm
• Compliance CMS 190µm/N
• Equivalent volume to the compliance VAS 12L
• Mechanical resistance RMS 5.23N·s/m

Dimensions

• Nominal diameter 8″
• 203mm
• Baffle cutout diameter 181mm
• Mounting depth 111mm
• Volume occupied by the driver 0.99L