GRS 8SMP-4

4Ω
8Ω

Woofer

Nominal diameter8″ / 218 mm
Resonance38 Hz
Q factor0.39
Sensitivity88.2 dB
Linear excursion± 5.5 mm
Program power120 W
GRS 8SMP-4 WooferGRS 8SMP-4 WooferGRS 8SMP-4 Woofer
Impedance
Excursion
Velocity
SPL
Phase
Group delay
Step response
Tone Burst
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

Specifications

  • Sensitivity (1W, 1m, infinite baffle) SPL1W 88.2dB
  • Frequency response 30 - 1500Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 38Hz
  • Mechanical quality factor QMS 2.69
  • Electrical quality factor QES 0.46
  • Total quality factor QTS 0.39

Large signal parameters

  • Maximum linear excursion (one way) xmax 5.5mm
  • Air volume displaced at xmax VD 116cm³
  • Power handling P 60W
  • Program power Pmax 120W

Voice Coil

  • Nominal impedance Z 4Ω
  • DC resistance RE 3.8Ω
  • Inductance (1kHz) LE 0.3mH
  • VC Diameter 39mm
  • Former material Aluminum

Magnet

  • Force factor Bl 7.56N/A
  • Motor constant Bl/√RE 3.88N/√W
  • Diameter 135mm
  • Height 25mm

Diaphragm

  • Effective diameter 164mm
  • Effective area SD 211cm²
  • Moving mass (including air load) MMS 29g
  • Moving mass MMD 26.6g
  • Material Damped poly cone

Suspensions

  • Stiffness KMS 1.64N/mm
  • Compliance CMS 610µm/N
  • Equivalent volume to the compliance VAS 37.6L
  • Mechanical resistance RMS 2.57N·s/m
  • Surround material Rubber

Dimensions

  • Nominal diameter 8″
  • 218mm
  • Overall diameter 218mm
  • Baffle cutout diameter 184mm
  • Overall depth 94mm
  • Flange thickness 6mm
  • Mounting depth 87mm
  • Volume occupied by the driver (estimated) 0.85L
Impedance
SPL
GRS 8SMP-4 Impedance
GRS 8SMP-4 SPL
GRS 8SMP-4 Dimensions
PDF fileDatasheet

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