Cerwin Vega ST122D

• Sensitivity (1W, 1m, infinite baffle) SPL1W 84.6dB

Thiele & Small parameters

• Resonance frequency (free air) fS 29Hz
• Mechanical quality factor QMS 3.30
• Electrical quality factor QES 0.51
• Total quality factor QTS 0.44

Large signal parameters

• Maximum linear excursion xmax 16.4mm
• Air volume displaced at xmax VD 804cm³
• Power handling P 1000W
• Program power Pmax 2000W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 3.3Ω
• Inductance (1kHz, in series, estimated) LE 2.96mH

Magnet

• Force factor (in series) Bl 17.5N/A
• Motor constant Bl/√RE 9.63N/√W
• Diameter 189mm

Diaphragm

• Effective diameter 250mm
• Effective area SD 490cm²
• Moving mass MMS 260g
• Moving mass (without air load) MMD 252g

Suspensions

• Stiffness KMS 8.62N/mm
• Compliance CMS 116µm/N
• Equivalent volume to the compliance VAS 39.2L
• Mechanical resistance RMS 14.4N·s/m

Dimensions

• Nominal diameter 12″
• 314mm
• Overall diameter 314mm
• Baffle cutout diameter 283mm
• Mounting depth 206mm
• Volume occupied by the driver 3.1L