Cerwin Vega SPRO122D

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85dB

Thiele & Small parameters

• Resonance frequency (free air) fS 25Hz
• Mechanical quality factor QMS 2.20
• Electrical quality factor QES 0.29
• Total quality factor QTS 0.26

Large signal parameters

• Maximum linear excursion xmax 33mm
• Air volume displaced at xmax VD 1617cm³
• Power handling P 2000W
• Program power Pmax 4000W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 2.9Ω
• Inductance (1kHz, in series, estimated) LE 3.04mH

Magnet

• Force factor (in series) Bl 22.8N/A
• Motor constant Bl/√RE 13.5N/√W

Diaphragm

• Effective diameter 250mm
• Effective area SD 490cm²
• Moving mass MMS 336g
• Moving mass (without air load) MMD 328g

Suspensions

• Stiffness KMS 8.26N/mm
• Compliance CMS 121µm/N
• Equivalent volume to the compliance VAS 41.7L
• Mechanical resistance RMS 24N·s/m

Dimensions

• Nominal diameter 12″
• 314mm
• Overall diameter 314mm
• Baffle cutout diameter 283mm
• Mounting depth 262mm
• Volume occupied by the driver 6.1L