Rockford Fosgate T1D212

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.2dB

Thiele & Small parameters

• Resonance frequency (free air) fS 28Hz
• Mechanical quality factor QMS 4.50
• Electrical quality factor QES 0.59
• Total quality factor QTS 0.52

Large signal parameters

• Maximum linear excursion xmax 16mm
• Air volume displaced at xmax VD 877cm³
• Power handling P 800W
• Program power Pmax 1600W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 3.3Ω
• Inductance (1kHz, in series) LE 1.8mH
• VC Diameter 76mm

Magnet

• Force factor (in series) Bl 15.5N/A
• Motor constant Bl/√RE 8.6N/√W
• Weight 3.49kg

Diaphragm

• Effective diameter 264mm
• Effective area SD 548cm²
• Moving mass MMS 247g
• Moving mass (without air load) MMD 238g

Suspensions

• Stiffness KMS 7.63N/mm
• Compliance CMS 131µm/N
• Equivalent volume to the compliance VAS 55.8L
• Mechanical resistance RMS 9.64N·s/m

Dimensions

• Nominal diameter 12″
• 305mm
• Baffle cutout diameter 285mm
• Mounting depth 171mm
• Volume occupied by the driver 3L