ALPINE R2-W8D2

2x2Ω
2x4Ω

Subwoofer

Nominal diameter8″ / 200 mm
Resonance42 Hz
Q factor0.48
Sensitivity83.6 dB
Linear excursion± 12 mm
Program power700 W
ALPINE R2-W8D2 SubwooferALPINE R2-W8D2 SubwooferALPINE R2-W8D2 Subwoofer
Excursion
Velocity
SPL
Phase
Group delay
Frequency
Hz
Impedance
Ω
Impedance phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical phase
°
Group delay
ms
Transient response
ms
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Specifications

  • Sensitivity (1W, 1m, infinite baffle) SPL1W 83.6dB
  • Frequency response 30 - 200Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 42Hz
  • Mechanical quality factor QMS 7.69
  • Electrical quality factor QES 0.52
  • Total quality factor QTS 0.48

Large signal parameters

  • Maximum linear excursion (one way) xmax 12mm
  • Maximum excursion before damage xlim 52mm
  • Air volume displaced at xmax VD 241cm³
  • Power handling P 350W
  • Program power Pmax 700W
  • Peak power Ppeak 1000W

Voice Coil

  • Nominal impedance Z 2 x 2Ω
  • DC resistance (in series) RE 3.6Ω
  • Inductance (1kHz, in series, estimated) LE 1.49mH
  • VC Diameter 40mm

Magnet

  • Force factor (in series) Bl 12.2N/A
  • Motor constant Bl/√RE 6.43N/√W
  • Diameter 137mm
  • Weight 1.588kg

Diaphragm

  • Effective diameter 160mm
  • Effective area SD 201cm²
  • Moving mass (including air load) MMS 81.6g
  • Moving mass MMD 80g
  • Material Hybrid poly ceramic composite

Suspensions

  • Stiffness KMS 5.68N/mm
  • Compliance CMS 176µm/N
  • Equivalent volume to the compliance VAS 10.1L
  • Mechanical resistance RMS 2.8N·s/m
  • Surround material High Amplitude Multi-Roll (HAMR)

Dimensions

  • Nominal diameter 8″
  • 200mm
  • Overall diameter 194mm
  • Baffle cutout diameter 176mm
  • Overall depth 138mm
  • Flange thickness 22mm
  • Mounting depth 116mm
  • Volume occupied by the driver (estimated) 1.2L
Impedance
Step response
Tone burst
ALPINE R2-W8D2 Dimensions
PDF fileDatasheet

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