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Product details

Key Features
  • 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
Advanced Specifications
  • 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.

Enclosure Recommendation
  • 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.

Best Suited For
  • 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
Why OSCA Backs This Product

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.

Trusted Brands for Serious Systems

Selected for Real-World Performance

Cutting Through the Noise of Car Audio

About Ground Zero 🚀

Ground Zero, established in 1995, is a German-engineered car audio brand with strong American performance roots, known for delivering high-output, competition-proven equipment built on real engineering, not hype. With distribution in over 80 countries and a full range of system components developed in Germany, the brand has earned global respect through consistent results in independent testing and demanding installs. From its origins in high-excursion subwoofer design to its evolution into a complete system solution, Ground Zero remains a go-to for enthusiasts and installers who value output, reliability, and proven performance.

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