Rockford Fosgate R1S4-12

Subwoofer

Nominal diameter12″ / 319 mm
Resonance30.5 Hz
Q factor0.54
Sensitivity88.4 dB
Linear excursion± 7 mm
Program Power400 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 88.4dB

Thiele & Small parameters

  • Resonance frequency (free air) fS 30.5Hz
  • Mechanical quality factor QMS 7.97
  • Electrical quality factor QES 0.58
  • Total quality factor QTS 0.54

Large signal parameters

  • Maximum linear excursion xmax 7mm
  • Air volume displaced at xmax VD 372cm³
  • Power handling P 200W
  • Program power Pmax 400W

Voice Coil

  • Nominal impedance Z 4Ω
  • DC resistance RE 3.5Ω
  • Inductance (1kHz) LE 2.1mH
  • VC Diameter 51mm

Magnet

  • Force factor Bl 11.8N/A
  • Motor constant Bl/√RE 6.31N/√W
  • Weight 1.13kg

Diaphragm

  • Effective diameter 260mm
  • Effective area SD 531cm²
  • Moving mass MMS 121g
  • Moving mass (without air load) MMD 112g

Suspensions

  • Stiffness KMS 4.43N/mm
  • Compliance CMS 226µm/N
  • Equivalent volume to the compliance VAS 90.4L
  • Mechanical resistance RMS 2.9N·s/m

Dimensions

  • Nominal diameter 12
  • 319mm
  • Overall diameter 319mm
  • Baffle cutout diameter 285mm
  • Mounting depth 125mm
  • Volume occupied by the driver 2.83L


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