• Product type: High-quality SQ midwoofer
• GZ Series: Plutonium Serie
  
• Model: GZPK 165SQ-C
  
• Diameter: 165 mm / 6.5″
  
• Power handling: 140W RMS / 200W max
  
• Impedance: 4 ohms
  
• Efficiency: 89 dB
  
• Frequency response: 40 Hz – 5000 Hz
  
• Voice coil: 38 mm / 1.5″
  
• Cone: Aluminum-ceramics
  
• Motor: High-efficiency hybrid motor with neodymium and ferrite magnets
  
• Voice coil construction: Lightweight 2-layer copper clad aluminum
  
• Basket: GZ-design aluminum cast basket
  
• Terminals: Gold-plated GZ-design screw terminals
  
• Magnet cover: Chrome plated
  
• Mounting diameter: 144 mm / 5.67″
  
• Mounting depth: 70 mm / 2.76″
  
• Resonance frequency (Fs): 38 Hz
  
• Grille: GZ hexagon style NRG protection grille with logo option
  
• Verification: Optimized using Klippel®
  
• Packaging: 1 pair

• Aluminum-ceramic cone delivers a more precise and controlled character than basic paper drivers
  
• Hybrid neodymium and ferrite motor balances efficiency, control, and usable output
  
• Ventilated cast basket supports better thermal behaviour and mechanical stability
  
• Wide usable bandwidth makes it a strong foundation for serious SQ front stages
  
• Premium terminals and hardware reflect the level of build expected in higher-end systems

• High-end front stage builds focused on sound quality
  
• Active or DSP-controlled systems needing a serious 6.5 inch midwoofer
  
• Users wanting more resolution and control than entry or mid-tier drivers offer
  
• Installations where midbass accuracy and tonal refinement matter
  
• Systems paired with quality tweeters, amplification, and proper tuning

This is the kind of midwoofer that makes sense when the rest of the system is already being taken seriously. If the goal is a more refined and better controlled front stage, starting with a driver like this gives you a much stronger foundation than a generic replacement speaker.