Ground Zero URANIUM GZUW 12SQ-D2

2x2Ω

Subwoofer

Nominal diameter12″ / 300 mm
Resonance39.8 Hz
Q factor0.67
Sensitivity87.8 dB
Linear excursion± 10 mm
Program Power1200 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 87.8dB

Thiele & Small parameters

  • Resonance frequency (free air) fS 39.8Hz
  • Mechanical quality factor QMS 14.38
  • Electrical quality factor QES 0.70
  • Total quality factor QTS 0.67

Large signal parameters

  • Maximum linear excursion (one way) xmax 10mm
  • Air volume displaced at xmax VD 527cm³
  • Power handling P 600W
  • Program power Pmax 1200W

Voice Coil

  • Nominal impedance Z 2 x 2Ω
  • DC resistance (in series) RE 4.0Ω
  • Inductance (1kHz, in series) LE 1.81mH
  • VC Diameter 50mm
  • Winding material Copper

Magnet

  • Force factor (in series) Bl 15.2N/A
  • Motor constant Bl/√RE 7.56N/√W

Diaphragm

  • Effective diameter 259mm
  • Effective area SD 527cm²
  • Moving mass MMS 159g
  • Moving mass (without air load) MMD 151g
  • Material Pressed and coated paper

Suspensions

  • Stiffness KMS 10N/mm
  • Compliance CMS 100µm/N
  • Equivalent volume to the compliance VAS 39.4L
  • Mechanical resistance RMS 2.77N·s/m
  • Spider material Polycot

Dimensions

  • Nominal diameter 12
  • 300mm
  • Overall diameter 315mm
  • Baffle cutout diameter 284mm
  • Mounting depth 157mm
  • Volume occupied by the driver (estimated) 2.6L
  • Frame material Aluminium cast

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