DB Drive WDX12 7KD4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 84.4dB

Thiele & Small parameters

• Resonance frequency (free air) fS 40.2Hz
• Mechanical quality factor QMS 6.16
• Electrical quality factor QES 0.46
• Total quality factor QTS 0.43

Large signal parameters

• Power handling P 3500W
• Program power Pmax 7000W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 6.8Ω
• Inductance (1kHz, in series, estimated) LE 7.22mH

Magnet

• Force factor (in series) Bl 35.4N/A
• Motor constant Bl/√RE 13.6N/√W

Diaphragm

• Effective diameter 234mm
• Effective area SD 432cm²
• Moving mass MMS 334g
• Moving mass (without air load) MMD 328g

Suspensions

• Stiffness KMS 20N/mm
• Compliance CMS 49.9µm/N
• Equivalent volume to the compliance VAS 13.2L
• Mechanical resistance RMS 13.7N·s/m

Dimensions

• Nominal diameter 12″
• 305mm
• Volume occupied by the driver (estimated) 2.4L