DB Drive WDX15 7KD4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.3dB

Thiele & Small parameters

• Resonance frequency (free air) fS 37.5Hz
• Mechanical quality factor QMS 7.01
• Electrical quality factor QES 0.55
• Total quality factor QTS 0.51

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 8.52mH

Magnet

• Force factor (in series) Bl 31.1N/A
• Motor constant Bl/√RE 11.9N/√W

Diaphragm

• Effective diameter 315mm
• Effective area SD 779cm²
• Moving mass MMS 428g
• Moving mass (without air load) MMD 413g

Suspensions

• Stiffness KMS 20N/mm
• Compliance CMS 49.9µm/N
• Equivalent volume to the compliance VAS 42.9L
• Mechanical resistance RMS 14.4N·s/m

Dimensions

• Nominal diameter 15″
• 381mm
• Volume occupied by the driver (estimated) 4.3L