GRS 12SMP-4

4Ω
8Ω

Woofer

Nominal diameter12″ / 332 mm
Resonance28 Hz
Q factor0.51
Sensitivity88.3 dB
Linear excursion± 5.5 mm
Program power180 W
GRS 12SMP-4 WooferGRS 12SMP-4 WooferGRS 12SMP-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 88.3dB
  • Frequency response 20 - 1500Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 28Hz
  • Mechanical quality factor QMS 3.10
  • Electrical quality factor QES 0.61
  • Total quality factor QTS 0.51

Large signal parameters

  • Maximum linear excursion (one way) xmax 5.5mm
  • Air volume displaced at xmax VD 284cm³
  • Power handling P 90W
  • Program power Pmax 180W

Voice Coil

  • Nominal impedance Z 4Ω
  • DC resistance RE 3.9Ω
  • Inductance (1kHz) LE 0.41mH
  • VC Diameter 50mm
  • Former material Aluminum

Magnet

  • Force factor Bl 10.2N/A
  • Motor constant Bl/√RE 5.16N/√W
  • Diameter 170mm
  • Height 25mm

Diaphragm

  • Effective diameter 256mm
  • Effective area SD 516cm²
  • Moving mass (including air load) MMS 93g
  • Moving mass MMD 84.2g
  • Material Poly

Suspensions

  • Stiffness KMS 2.86N/mm
  • Compliance CMS 350µm/N
  • Equivalent volume to the compliance VAS 132L
  • Mechanical resistance RMS 5.28N·s/m
  • Surround material Rubber

Dimensions

  • Nominal diameter 12″
  • 332mm
  • Overall diameter 332mm
  • Baffle cutout diameter 284mm
  • Overall depth 136mm
  • Flange thickness 8mm
  • Mounting depth 129mm
  • Volume occupied by the driver (estimated) 2.5L
Impedance
SPL
GRS 12SMP-4 Impedance
GRS 12SMP-4 SPL
GRS 12SMP-4 Dimensions
PDF fileDatasheet

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