GRS 4FR-8

8Ω

Full-range

Nominal diameter4.5″ / 114 mm
Resonance127 Hz
Q factor0.70
Sensitivity88.5 dB
Linear excursion± 1 mm
Program power30 W
GRS 4FR-8 Full-rangeGRS 4FR-8 Full-rangeGRS 4FR-8 Full-range
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 88.5dB
  • Frequency response 100 - 10000Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 127Hz
  • Mechanical quality factor QMS 6.71
  • Electrical quality factor QES 0.78
  • Total quality factor QTS 0.70

Large signal parameters

  • Maximum linear excursion (one way) xmax 1mm
  • Air volume displaced at xmax VD 6.6cm³
  • Power handling P 15W
  • Program power Pmax 30W

Voice Coil

  • Nominal impedance Z 8Ω
  • DC resistance RE 6.9Ω
  • Inductance (1kHz) LE 0.7mH
  • VC Diameter 25mm

Magnet

  • Force factor Bl 6.4N/A
  • Motor constant Bl/√RE 2.44N/√W
  • Diameter 80mm
  • Height 21mm

Diaphragm

  • Effective diameter 92mm
  • Effective area SD 66.1cm²
  • Moving mass (including air load) MMS 5.8g
  • Moving mass MMD 5.4g
  • Material Paper

Suspensions

  • Stiffness KMS 3.7N/mm
  • Compliance CMS 270µm/N
  • Equivalent volume to the compliance VAS 1.7L
  • Mechanical resistance RMS 0.69N·s/m

Dimensions

  • Nominal diameter 4.5″
  • 114mm
  • Overall diameter 120mm
  • Overall depth 69mm
  • Flange thickness 6mm
  • Mounting depth 55mm
  • Volume occupied by the driver (estimated) 0.25L
Impedance
SPL
GRS 4FR-8 Impedance
GRS 4FR-8 SPL
GRS 4FR-8 Dimensions
PDF fileDatasheet

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