GRS 3FR-4

4Ω

Full-range

Nominal diameter3″ / 81 mm
Resonance145 Hz
Q factor0.85
Sensitivity84.8 dB
Linear excursion± 2 mm
Program power20 W
GRS 3FR-4 Full-rangeGRS 3FR-4 Full-rangeGRS 3FR-4 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 84.8dB
  • Frequency response 100 - 16000Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 145Hz
  • Mechanical quality factor QMS 4.76
  • Electrical quality factor QES 1.03
  • Total quality factor QTS 0.85

Large signal parameters

  • Maximum linear excursion (one way) xmax 2mm
  • Air volume displaced at xmax VD 6.2cm³
  • Power handling P 10W
  • Program power Pmax 20W

Voice Coil

  • Nominal impedance Z 4Ω
  • DC resistance RE 3.5Ω
  • Inductance (1kHz) LE 0.4mH
  • VC Diameter 19mm

Magnet

  • Force factor Bl 3N/A
  • Motor constant Bl/√RE 1.6N/√W
  • Diameter 60mm
  • Height 10mm

Diaphragm

  • Effective diameter 63mm
  • Effective area SD 31.2cm²
  • Moving mass (including air load) MMS 3g
  • Moving mass MMD 2.9g
  • Material Coated paper

Suspensions

  • Stiffness KMS 2.5N/mm
  • Compliance CMS 400µm/N
  • Equivalent volume to the compliance VAS 0.6L
  • Mechanical resistance RMS 0.57N·s/m
  • Surround material Foam

Dimensions

  • Nominal diameter 3″
  • 81mm
  • Overall diameter 81mm
  • Baffle cutout diameter 78mm
  • Overall depth 42mm
  • Flange thickness 3mm
  • Mounting depth 40mm
  • Volume occupied by the driver (estimated) 0.11L
Impedance
SPL
GRS 3FR-4 Impedance
GRS 3FR-4 SPL
GRS 3FR-4 Dimensions
PDF fileDatasheet

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