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Product details

Key Features
  • Delivers strong, physical midbass where smaller drivers run out of authority
  • High-efficiency design helps produce serious output with sensible amplifier power
  • Long-stroke motor and suspension design support punch and usable excursion
  • Wide bandwidth makes it effective in aggressive front stage and saddlebag applications
  • Built for installs where projection and midbass impact matter most
Advanced Specifications
  • Product type: SPL midwoofer
  • Model: GZCK 250XSPL
  • Series: Competition Series
  • Diameter: 250 mm / 9.84″
  • Power handling: 200W RMS / 400W max
  • Impedance: 4 ohms
  • Efficiency: 93 dB
  • Frequency response: 40 Hz – 6 kHz
  • Voice coil: 50 mm / 2″ CCA
  • Cone: Fiber reinforced paper
  • Surround: Long stroke foam
  • Basket: Resonance-free steel
  • Dust cap: Paper
  • Terminals: Soldering terminal
  • Mounting diameter: 235 mm / 9.25″
  • Mounting depth: 110 mm / 4.33″
  • Resonance frequency (Fs): 44 Hz
  • Grille: GZCK 250 XSPL grille available separately
  • Packaging: 1 piece
Best Suited For
  • Harley-Davidson saddlebag upgrades
  • High-output front stage builds using large-format midbass drivers
  • Systems chasing stronger midbass punch and projection
  • Installations where a 6.5 or 8 inch driver is not enough
  • Users wanting more authority through the midbass region without using a subwoofer for that job
Why OSCA Backs This Product

This kind of driver makes sense when you want real midbass, not just more speaker area. In the right install, a 10 inch midwoofer like this can bring the sort of punch and presence that smaller drivers usually struggle to match.

Trusted Brands for Serious Systems

Selected for Real-World Performance

Cutting Through the Noise of Car Audio

Proven Performance. Engineered in Germany.

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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