Rockford Fosgate T0D412

• Sensitivity (1W, 1m, infinite baffle) SPL1W 84.6dB

Thiele & Small parameters

• Resonance frequency (free air) fS 26Hz
• Mechanical quality factor QMS 6.00
• Electrical quality factor QES 0.58
• Total quality factor QTS 0.53

Large signal parameters

• Maximum linear excursion xmax 14.8mm
• Air volume displaced at xmax VD 811cm³
• Power handling P 700W
• Program power Pmax 1400W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 6.2Ω
• Inductance (1kHz, in series) LE 8.4mH
• VC Diameter 76mm

Magnet

• Force factor (in series) Bl 22.5N/A
• Motor constant Bl/√RE 9.04N/√W
• Weight 3.01kg

Diaphragm

• Effective diameter 264mm
• Effective area SD 548cm²
• Moving mass MMS 291g
• Moving mass (without air load) MMD 282g

Suspensions

• Stiffness KMS 7.75N/mm
• Compliance CMS 129µm/N
• Equivalent volume to the compliance VAS 55.1L
• Mechanical resistance RMS 7.91N·s/m

Dimensions

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