DB Drive PTW15D4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.7dB

Thiele & Small parameters

• Resonance frequency (free air) fS 38.9Hz
• Mechanical quality factor QMS 4.94
• Electrical quality factor QES 0.73
• Total quality factor QTS 0.63

Large signal parameters

• Maximum linear excursion xmax 17.5mm
• Air volume displaced at xmax VD 1442cm³
• Power handling P 900W
• Program power Pmax 1750W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 6.4Ω
• Inductance (1kHz, in series) LE 3.84mH

Magnet

• Force factor (in series) Bl 28N/A
• Motor constant Bl/√RE 11.1N/√W

Diaphragm

• Effective diameter 324mm
• Effective area SD 824cm²
• Moving mass MMS 364g
• Moving mass (without air load) MMD 348g

Suspensions

• Stiffness KMS 20N/mm
• Compliance CMS 50µm/N
• Equivalent volume to the compliance VAS 44.2L
• Mechanical resistance RMS 18N·s/m

Dimensions

• Nominal diameter 15″
• 381mm
• Volume occupied by the driver 6.2L