Rockford Fosgate P3D4-15

2x4Ω

Subwoofer

Nominal diameter15″ / 381 mm
Resonance22.4 Hz
Q factor0.57
Sensitivity86.4 dB
Linear excursion± 15.9 mm
Program Power1200 W
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
Discard
Apply
  • Sensitivity (1W, 1m, infinite baffle) SPL1W 86.4dB

Thiele & Small parameters

  • Resonance frequency (free air) fS 22.4Hz
  • Mechanical quality factor QMS 4.90
  • Electrical quality factor QES 0.64
  • Total quality factor QTS 0.57

Large signal parameters

  • Maximum linear excursion xmax 15.9mm
  • Air volume displaced at xmax VD 1422cm³
  • Power handling P 600W
  • Program power Pmax 1200W

Voice Coil

  • Nominal impedance Z 2 x 4Ω
  • DC resistance (in series) RE 6.4Ω
  • Inductance (1kHz, in series) LE 6.45mH
  • VC Diameter 64mm

Magnet

  • Force factor (in series) Bl 22.8N/A
  • Motor constant Bl/√RE 9.01N/√W
  • Weight 2.72kg

Diaphragm

  • Effective diameter 337mm
  • Effective area SD 894cm²
  • Moving mass MMS 369g
  • Moving mass (without air load) MMD 351g

Suspensions

  • Stiffness KMS 7.3N/mm
  • Compliance CMS 137µm/N
  • Equivalent volume to the compliance VAS 156L
  • Mechanical resistance RMS 10.6N·s/m

Dimensions

  • Nominal diameter 15
  • 381mm
  • Baffle cutout diameter 353mm
  • Mounting depth 193mm
  • Volume occupied by the driver 4.19L


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