Rockford Fosgate T0D212

• Sensitivity (1W, 1m, infinite baffle) SPL1W 84.8dB

Thiele & Small parameters

• Resonance frequency (free air) fS 25.3Hz
• Mechanical quality factor QMS 6.50
• Electrical quality factor QES 0.51
• Total quality factor QTS 0.47

Large signal parameters

• Maximum linear excursion xmax 14mm
• Air volume displaced at xmax VD 767cm³
• Power handling P 700W
• Program power Pmax 1400W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 3.5Ω
• Inductance (1kHz, in series) LE 5.34mH
• VC Diameter 76mm

Magnet

• Force factor (in series) Bl 18.3N/A
• Motor constant Bl/√RE 9.78N/√W
• Weight 3.01kg

Diaphragm

• Effective diameter 264mm
• Effective area SD 548cm²
• Moving mass MMS 307g
• Moving mass (without air load) MMD 298g

Suspensions

• Stiffness KMS 7.75N/mm
• Compliance CMS 129µm/N
• Equivalent volume to the compliance VAS 55L
• Mechanical resistance RMS 7.5N·s/m

Dimensions

• Nominal diameter 12″
• 305mm
• Baffle cutout diameter 285mm
• Mounting depth 175mm
• Volume occupied by the driver 3L