Rockford Fosgate RM112D4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 90.7dB

Thiele & Small parameters

• Resonance frequency (free air) fS 28.5Hz
• Mechanical quality factor QMS 10.06
• Electrical quality factor QES 0.62
• Total quality factor QTS 0.58

Large signal parameters

• Maximum linear excursion xmax 7mm
• Air volume displaced at xmax VD 410cm³
• Power handling P 200W
• Program power Pmax 400W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 7.4Ω
• Inductance (1kHz, in series) LE 7.02mH
• VC Diameter 51mm
• Former material Aluminum

Magnet

• Force factor (in series) Bl 24.6N/A
• Motor constant Bl/√RE 6.39N/√W
• Weight 1.13kg

Diaphragm

• Effective diameter 273mm
• Effective area SD 585cm²
• Moving mass MMS 141g
• Moving mass (without air load) MMD 131g

Suspensions

• Stiffness KMS 4.51N/mm
• Compliance CMS 222µm/N
• Equivalent volume to the compliance VAS 108L
• Mechanical resistance RMS 2.5N·s/m

Dimensions

• Nominal diameter 12″
• 305mm
• Baffle cutout diameter 276mm
• Mounting depth 122mm
• Volume occupied by the driver 3.4L