MTX Audio T812S-44

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.7dB
• Frequency response 23 - 500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 32Hz
• Mechanical quality factor QMS 8.12
• Electrical quality factor QES 0.88
• Total quality factor QTS 0.79

Large signal parameters

• Maximum linear excursion xmax 20mm
• Air volume displaced at xmax VD 1404cm³
• Power handling P 750W
• Program power Pmax 2250W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 6.4Ω
• Inductance (1kHz, in series, estimated) LE 6.12mH

Magnet

• Force factor (in series) Bl 20.2N/A
• Motor constant Bl/√RE 7.98N/√W

Diaphragm

• Effective diameter 299mm
• Effective area SD 702cm²
• Moving mass MMS 286g
• Moving mass (without air load) MMD 275g

Suspensions

• Stiffness KMS 11.5N/mm
• Compliance CMS 87µm/N
• Equivalent volume to the compliance VAS 60.2L
• Mechanical resistance RMS 7.07N·s/m

Dimensions

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