Cerwin Vega H4124D

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.8dB

Thiele & Small parameters

• Resonance frequency (free air) fS 27.7Hz
• Mechanical quality factor QMS 7.90
• Electrical quality factor QES 0.53
• Total quality factor QTS 0.50

Large signal parameters

• Maximum linear excursion xmax 14mm
• Air volume displaced at xmax VD 686cm³
• Power handling P 250W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 9.2Ω
• Inductance (1kHz, in series, estimated) LE 5.45mH

Magnet

• Force factor (in series) Bl 20.5N/A
• Motor constant Bl/√RE 6.76N/√W
• Diameter 165mm

Diaphragm

• Effective diameter 250mm
• Effective area SD 490cm²
• Moving mass MMS 139g
• Moving mass (without air load) MMD 131g

Suspensions

• Stiffness KMS 4.22N/mm
• Compliance CMS 237µm/N
• Equivalent volume to the compliance VAS 80.8L
• Mechanical resistance RMS 3.07N·s/m

Dimensions

• Nominal diameter 12″
• 323mm
• Overall diameter 323mm
• Baffle cutout diameter 259mm
• Mounting depth 136mm
• Volume occupied by the driver (estimated) 2.8L