Ground Zero GZTW 25T

Autohifi subwoofer

Manufacturer parameters
  • Diameter: 10" (25cm)
  • Power (W): 300
  • Impedance (Ohm): 4
  • Sensitivity (db/1W): 86,2
  • Qts: ?
  • Price: 80
  • Diaphragm: polypropylene
  • Basket: sheet steel
  • Magnet: single
Measured parameters
  • Fs = 32.17 Hz
  • Re = 3.40 ohms[dc]
  • Le = 2.4 mH
  • Qt = 0.39
  • Qes = 0.42
  • Qms = 5.4
  • Mms = 132.61 grams
  • Rms = 4.96 kg/s
  • Cms = 0.000185 m/N
  • Vas = 25.58 liters
  • Sd= 314.16 cm^2
  • Bl = 14.76 Tm
  • ETA = 0.2 %
  • Lp(2.83V/1m) = 88.74 dB (86dB/1W/1m)
  • gamma = 111.3
  • EBP=76 Hz (bassreflex/sealed)


Average woofer with average parameters. Suitable for both bass-reflex and sealed enclosure, doesn't need a lot of enclosure volume to work with.

front rear vents and terminal Diaphragm and suspension