Rockford Fosgate PM210S4

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

Thiele & Small parameters

• Resonance frequency (free air) fS 45Hz
• Mechanical quality factor QMS 9.00
• Electrical quality factor QES 0.64
• Total quality factor QTS 0.57

Large signal parameters

• Maximum linear excursion xmax 10mm
• Air volume displaced at xmax VD 346cm³

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.6Ω
• Inductance (1kHz) LE 0.3mH
• VC Diameter 51mm
• Former material Aluminum

Magnet

• Force factor Bl 12.9N/A
• Motor constant Bl/√RE 6.8N/√W
• Weight 1.54kg

Diaphragm

• Effective diameter 210mm
• Effective area SD 346cm²
• Moving mass MMS 105g
• Moving mass (without air load) MMD 101g

Suspensions

• Stiffness KMS 8.4N/mm
• Compliance CMS 119µm/N
• Equivalent volume to the compliance VAS 20.2L
• Mechanical resistance RMS 3.3N·s/m

Dimensions

• Nominal diameter 10″
• 254mm
• Baffle cutout diameter 228mm
• Mounting depth 140mm
• Volume occupied by the driver 4.36L