GB Series subwoofers are designed for high power handling and optimized to provide superior low frequency extension from a wide range of sealed and vented enclosures.  A copper inductance-reducing pole piece cap also reduces distortion and extends the range of flat response well into the midbass.

The GB12D2 includes a vented, cast aluminum basket, dual 2 ohm voice coils and a convenient switch to select a 1 ohm or 4 ohm configuration.

 


  • Treated Paper Cone
  • 3” (75 mm) Voice Coil on Fiberglass Former
  • Dual 2 Ω Voice Coils
  • Impedance Selection Switch
  • Copper Inductance- and Distortion-Reducing Pole Piece Cap
  • Extended Pole Piece
  • Flared Pole Piece Vent
  • Dual Ferrite Magnets
  • Machined Back Plate
  • Proprietary Vented Cast Aluminum Basket
  • Tinsel Leads Stitched to the Spider
  • Flat, Progressive Nomex® Spider
  • Nitrile Butadiene Rubber Surround
  • Screw Terminals

Specifications:

  • Nominal Impedance: 1 or 4 ohms
  • RMS Power Handling: 500 W
  • Peak Power Handling: 1500 W
  • Frequency Response (-3 dB): 22 Hz – 180 kHz
  • Sensitivity (2.83 V/1 M): 95 dB (1 Ω configuration)
  • Recommended Amplifier Power Range: 100 W – 1000 W

Dimensions:

  • Cut-out diameter: 281 mm (11-1/16”)
  • Overall Diameter: 320 mm (12-5/8”)
  • Mounting Depth: 169 mm (6-5/8”)
  • Mounting Height: 17.5 mm (11/16”)

ENCLOSURE PERFORMANCE (SEE OWNER’S MANUAL FOR DETAILS):

Sealed Enclosure Volume: 28.3 liters (1 ft³):

Vented Enclosure Volume and Tuning: 42.5 liters (1.5 ft³), 33 Hz:

Thiele & Small Parameters:

  • Revc: 1 Ω or 4Ω
  • Levc@1kHz: 0.33 mH (2 Ω configuration)
  • Sd: 510.7 cm2
  • Mmd: 183 g
  • Mms: 189 g
  • Cms: 153 µM/N
  • Vas: 57 liters
  • Fs: 29.5 Hz
  • BL: 8.37 TM (1Ω configuration)
  • Qms: 8.44
  • Qes: 0.52
  • Qts: 0.49
  • Xmax (1-way linear): 17.6 mm (11/16”)
  • Basket Displacement: 4.17 liters (0.147 ft3)
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