Rockford Fosgate T3-BMW-SUB

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87dB

Thiele & Small parameters

• Resonance frequency (free air) fS 38Hz
• Mechanical quality factor QMS 2.26
• Electrical quality factor QES 0.63
• Total quality factor QTS 0.49

Large signal parameters

• Maximum linear excursion xmax 7mm
• Air volume displaced at xmax VD 170cm³
• Power handling P 150W
• Program power Pmax 300W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.7Ω
• Inductance (1kHz) LE 0.61mH
• VC Diameter 51mm

Magnet

• Force factor Bl 7.1N/A
• Motor constant Bl/√RE 3.69N/√W

Diaphragm

• Effective diameter 176mm
• Effective area SD 243cm²
• Moving mass MMS 36.2g
• Moving mass (without air load) MMD 33.6g

Suspensions

• Stiffness KMS 2.06N/mm
• Compliance CMS 485µm/N
• Equivalent volume to the compliance VAS 40.6L
• Mechanical resistance RMS 3.82N·s/m

Dimensions

• Nominal diameter 8″
• 203mm
• Baffle cutout diameter 195mm
• Mounting depth 31mm
• Volume occupied by the driver (estimated) 0.85L