Ground Zero IRIDIUM GZIW 250

Subwoofer

Nominal diameter10″ / 250 mm
Resonance27 Hz
Q factor0.44
Sensitivity84.8 dB
Linear excursion± 12.5 mm
Program Power500 W
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

Thiele & Small parameters

  • Resonance frequency (free air) fS 27Hz
  • Mechanical quality factor QMS 10.73
  • Electrical quality factor QES 0.45
  • Total quality factor QTS 0.44

Large signal parameters

  • Maximum linear excursion (one way) xmax 12.5mm
  • Air volume displaced at xmax VD 449cm³
  • Power handling P 250W
  • Program power Pmax 500W

Voice Coil

  • Nominal impedance Z 4Ω
  • DC resistance RE 3.6Ω
  • Inductance (1kHz) LE 2.36mH
  • VC Diameter 50mm
  • Winding material Copper

Magnet

  • Force factor Bl 13.2N/A
  • Motor constant Bl/√RE 6.98N/√W

Diaphragm

  • Effective diameter 214mm
  • Effective area SD 360cm²
  • Moving mass MMS 137g
  • Moving mass (without air load) MMD 133g
  • Material HQPP

Suspensions

  • Stiffness KMS 3.72N/mm
  • Compliance CMS 269µm/N
  • Equivalent volume to the compliance VAS 49.3L
  • Mechanical resistance RMS 2.17N·s/m
  • Surround material Rubber
  • Spider material Polycot

Dimensions

  • Nominal diameter 10
  • 250mm
  • Overall diameter 257mm
  • Baffle cutout diameter 230mm
  • Mounting depth 129mm
  • Volume occupied by the driver (estimated) 1.6L
  • Frame material Steel

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