DB Drive WDX18 7KD2

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.5dB

Thiele & Small parameters

• Resonance frequency (free air) fS 30.4Hz
• Mechanical quality factor QMS 8.47
• Electrical quality factor QES 0.55
• Total quality factor QTS 0.52

Large signal parameters

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

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 4.0Ω
• Inductance (1kHz, in series, estimated) LE 7.45mH

Magnet

• Force factor (in series) Bl 32.7N/A
• Motor constant Bl/√RE 16.4N/√W

Diaphragm

• Effective diameter 382mm
• Effective area SD 1144cm²
• Moving mass MMS 777g
• Moving mass (without air load) MMD 749g

Suspensions

• Stiffness KMS 28.3N/mm
• Compliance CMS 35.3µm/N
• Equivalent volume to the compliance VAS 65.5L
• Mechanical resistance RMS 17.5N·s/m

Dimensions

• Nominal diameter 18″
• 457mm
• Volume occupied by the driver (estimated) 6.9L