• Product type: High-performance SPL subwoofer
  
• Model: GZNW 30SPL-D2
  
• Diameter: 30 cm / 12″
  
• Power handling: 3000W RMS / 6000W max
  
• Impedance: 2 x 2 ohms
  
• Efficiency: 86.3 dB
  
• Power recommendation: 2000 – 6000W
  
• Voice coil: 75 mm / 3″ CCA round wire
  
• Cone: Reinforced paper
  
• Basket: Solid aluminum cast
  
• Spider: 4-layer Nomex
  
• Dust cap: Carbon design
  
• Xmax: 70 mm / 2.76″
  
• Mounting diameter: 281 mm / 11.06″
  
• Mounting depth: 237 mm / 9.33″
  
• Resonance frequency (Fs): 41.3 Hz
  
• Qts: 0.54
  
• Vas: 25 L / 0.88 cu.ft.
  
• Verification: Klippel® optimized

• Massive 70 mm Xmax gives it the excursion to produce serious low-frequency output
  
• 3 inch CCA voice coil is built to handle real amplifier power
  
• Heavy-duty cast basket keeps the structure stable under extreme load
  
• 4-layer Nomex spider supports control and durability at high excursion
  
• Dual 2 ohm configuration gives flexible amplifier matching for high-power systems

• Vented enclosure: 60L net / 2.12 cu.ft.
  
• Port (dimensions): 10 cm / 4"
  
• Port length: 4.13"
  
• Fb / F3 (-3 dB): 47 Hz / 37 Hz

* Above-mentioned enclosure recommendations are just a few possible variations. Please note that you should find the perfect tuning, especially port length, based on your car and own taste.

• High-output daily systems using serious mono amplification
  
• SPL-focused builds wanting a hard-hitting 12 inch substage
  
• Systems chasing strong bass authority without moving to a larger 15
  
• Large enclosure builds designed around output and impact
  
• Installations with the electrical support to run real power properly
  

What stands out here is the combination of 70 mm Xmax and the 3 inch CCA voice coil. That gives the sub both the excursion to move serious air and the thermal capacity to handle real power, which is exactly what makes a high-output 12 actually feel convincing in the car.