MTX Audio T812-44

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85dB
• Frequency response 32 - 200Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 32.4Hz
• Mechanical quality factor QMS 3.88
• Electrical quality factor QES 0.86
• Total quality factor QTS 0.71

Large signal parameters

• Maximum linear excursion xmax 16mm
• Air volume displaced at xmax VD 837cm³
• Power handling P 500W
• Program power Pmax 1500W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 7.3Ω
• Inductance (1kHz, in series, estimated) LE 5.35mH

Magnet

• Force factor (in series) Bl 18.6N/A
• Motor constant Bl/√RE 6.87N/√W

Diaphragm

• Effective diameter 258mm
• Effective area SD 523cm²
• Moving mass MMS 191g
• Moving mass (without air load) MMD 183g

Suspensions

• Stiffness KMS 8.33N/mm
• Compliance CMS 120µm/N
• Equivalent volume to the compliance VAS 46.4L
• Mechanical resistance RMS 10N·s/m

Dimensions

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