Ground Zero IRIDIUM GZIW 12XSPL-D2

2x2Ω

Subwoofer

Nominal diameter12″ / 300 mm
Resonance32.5 Hz
Q factor0.73
Sensitivity84.8 dB
Linear excursion± 17 mm
Program Power1000 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 32.5Hz
  • Mechanical quality factor QMS 10.76
  • Electrical quality factor QES 0.79
  • Total quality factor QTS 0.73

Large signal parameters

  • Maximum linear excursion (one way) xmax 17mm
  • Air volume displaced at xmax VD 881cm³
  • Power handling P 600W
  • Program power Pmax 1000W

Voice Coil

  • Nominal impedance Z 2 x 2Ω
  • DC resistance (in series) RE 4.3Ω
  • Inductance (1kHz, in series) LE 2.48mH
  • VC Diameter 63mm
  • Winding material Copper

Magnet

  • Force factor (in series) Bl 15.9N/A
  • Motor constant Bl/√RE 7.64N/√W

Diaphragm

  • Effective diameter 257mm
  • Effective area SD 518cm²
  • Moving mass MMS 231g
  • Moving mass (without air load) MMD 223g
  • Material Reinforced paper

Suspensions

  • Stiffness KMS 9.43N/mm
  • Compliance CMS 106µm/N
  • Equivalent volume to the compliance VAS 40.4L
  • Mechanical resistance RMS 4.38N·s/m
  • Surround material High-roll sandwich
  • Spider material Progressive 2-layer

Dimensions

  • Nominal diameter 12
  • 300mm
  • Overall diameter 310mm
  • Baffle cutout diameter 285mm
  • Mounting depth 162mm
  • Volume occupied by the driver (estimated) 2.5L

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