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Product details

Key Features
  • Double-coated silk dome helps deliver a smooth, refined top end without harshness
  • Polished stainless steel housing doubles as a tuned rear chamber for better control
  • Low resonance frequency gives more flexibility in serious active system design
  • Neodymium motor supports speed, detail, and compact packaging
  • Built for sound-quality systems where staging and tonal precision matter
Advanced Specifications
  • Product type: High-end tweeter
  • Series: Plutonium Series
  • Model: GZPT 28SQ
  • Diameter: 28 mm / 1.10″
  • Power handling: 100W RMS / 150W max
  • Impedance: 4 ohms
  • Efficiency: 90 dB
  • Frequency response: 2000 Hz – 30 kHz
  • Cone / dome: 2-layer coated silk
  • Motor: Neodymium
  • Housing: Polished stainless steel
  • Rear chamber: Damped coupled chamber
  • Voice coil: High power capable copper voice coil
  • Terminals: Gold-plated screw terminals
  • Mounting diameter: 48 mm / 1.89″
  • Mounting depth: 35 mm / 1.38″
  • Resonance frequency (Fs): 770 Hz
  • Country of manufacture: Made in Germany
  • Packaging: 1 pair
Best Suited For
  • High-end 2-way and 3-way SQ systems
  • Active and DSP-controlled front stage builds
  • Users chasing smoother, more realistic high-frequency reproduction
  • Installations focused on staging, imaging, and tonal refinement
  • Systems paired with serious midrange or midwoofer components
Why OSCA Backs This Product

A tweeter like this makes sense when the goal is refinement, not just more top end. In the right system, it helps bring better focus, smoother detail, and a more believable sense of space to the front stage.

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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