DB Drive PTW15D4

2x4Ω

Subwoofer

Nominal diameter	15″ / 381 mm
Resonance	38.9 Hz
Q factor	0.63
Sensitivity	87.7 dB
Linear excursion	± 17.5 mm
Program power	1750 W

Discontinued

DB Drive PTW15D4 Subwoofer

Specifications

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 (one way) 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 (including air load) MMS 364g
Moving mass 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

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