• Product type: High-quality SPL subwoofer
  
• Model: GZHW 38XSPL-D2
  
• Diameter: 38 cm / 15″
  
• Power handling: 1500W RMS / 3500W max
  
• Impedance: 2 x 2 ohms
  
• Efficiency: 87 dB
  
• Power recommendation: 1500 – 3500W
  
• Voice coil: 75 mm / 3″ copper
  
• Cone: Reinforced paper
  
• Surround: Long stroke compound surround
  
• Basket: Solid aluminum cast
  
• Spider: 2-layer Polycot
  
• Dust cap: IMPP with 3D structure logo
  
• Xmax: 45 mm / 1.77″
  
• Mounting diameter: 360 mm / 14.17″
  
• Resonance frequency (Fs): 36.3 Hz
  
• Qts: 0.52
  
• Vas: 32.8 L / 1.16 cu.ft.
  
• Verification: Klippel® optimized

*Please refer to documents for more advanced specifications.

• Long-stroke suspension and 45 mm Xmax support serious low-frequency output
  
• 3 inch copper voice coil gives it the thermal capacity for real amplifier power
  
• Solid cast basket helps maintain control and stability under heavy load
  
• Reinforced paper cone is built for impact, control, and SPL-focused use
  
• Dual 2 ohm configuration gives flexible amplifier matching for high-power systems

• Vented enclosure: 90L net / 3.18 cu.ft.
  
• Port: 16 cm / 6.3"
  
• Port length: 11.81"
  
• F3: 40 Hz / 31 Hz
  
• Sealed enclosure (minimum): 40L net / 1.41 cu.ft.
  
• Qtc / F3: 0.89 / 45 Hz
  
• Sealed enclosure (recommended): 90L net / 3.18 cu.ft.
  
• Qtc / F3: 0.77 / 43 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 chasing strong low-frequency impact
  
• Large enclosure systems built around output and pressure
  
• Users wanting a serious 15 without stepping into extreme competition-only hardware
  
• Builds with the electrical support to handle substantial power demand

The standout here is the 3 inch copper voice coil. That is what gives this sub real credibility in a serious build, because it means the driver is actually built to cope with the kind of power people run in this category instead of just advertising big numbers.