MTX Audio FPR12-04

• Sensitivity (1W, 1m, infinite baffle) SPL1W 83.6dB
• Frequency response 22 - 150Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 30Hz
• Mechanical quality factor QMS 5.52
• Electrical quality factor QES 0.94
• Total quality factor QTS 0.80

Large signal parameters

• Maximum linear excursion xmax 13mm
• Air volume displaced at xmax VD 706cm³
• Power handling P 400W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.4Ω
• Inductance (1kHz, estimated) LE 3.05mH

Magnet

• Force factor Bl 13.4N/A
• Motor constant Bl/√RE 7.28N/√W

Diaphragm

• Effective diameter 263mm
• Effective area SD 543cm²
• Moving mass MMS 264g
• Moving mass (without air load) MMD 255g

Suspensions

• Stiffness KMS 9.43N/mm
• Compliance CMS 106µm/N
• Equivalent volume to the compliance VAS 44.1L
• Mechanical resistance RMS 9.02N·s/m

Dimensions

• Nominal diameter 12″
• 300mm
• Volume occupied by the driver (estimated) 2.3L