Rockford Fosgate T0D215

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.4dB

Thiele & Small parameters

• Resonance frequency (free air) fS 25.5Hz
• Mechanical quality factor QMS 6.50
• Electrical quality factor QES 0.47
• Total quality factor QTS 0.44

Large signal parameters

• Maximum linear excursion xmax 14mm
• Air volume displaced at xmax VD 1183cm³
• Power handling P 800W
• Program power Pmax 1600W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 3.4Ω
• Inductance (1kHz, in series) LE 5.1mH
• VC Diameter 76mm

Magnet

• Force factor (in series) Bl 22N/A
• Motor constant Bl/√RE 11.9N/√W
• Weight 4.99kg

Diaphragm

• Effective diameter 328mm
• Effective area SD 845cm²
• Moving mass MMS 419g
• Moving mass (without air load) MMD 402g

Suspensions

• Stiffness KMS 10.8N/mm
• Compliance CMS 93µm/N
• Equivalent volume to the compliance VAS 94.4L
• Mechanical resistance RMS 10.3N·s/m

Dimensions

• Nominal diameter 15″
• 381mm
• Baffle cutout diameter 353mm
• Mounting depth 213mm
• Volume occupied by the driver 5.41L