Ground Zero GZTW 12 mk.2

Autohifi subwoofer

Manufacturer parameters
  • Diameter: 12" (30cm)
  • Power (W): 400
  • Impedance (Ohm): 4
  • Sensitivity (db/1W): 86,7
  • Qts: 0,48
  • Price: 65€
  • Diaphragm: Polypropylene
  • Basket: sheet steel
  • Magnet: single
Measured parameters
  • Fs = 21.72 Hz (22,5Hz according to GZ)
  • Re = 3.90 ohms[dc]
  • Le = 3577.93 uH
  • Qt = 0.48
  • Qes = 0.54
  • Qms = 5.01
  • Mms = 92.26 grams
  • Cms = 0.000582 m/N
  • Vas = 181.72 liters (148,6l according to GZ)
  • Sd= 471.44 cm^2
  • Bl = 9.565252 Tm
  • ETA = 0.33 %
  • Lp(2.83V/1m) = 90.46 dB (87dB/1W/1m)
  • gamma = 103,7
  • EBP=40 Hz (sealed)



Recommended enclosure:
SQ - Closed 30l
SPL - Bassreflex 50l @ 41Hz (port area at least 110cm2)

Interesting cheap woofer, good for some SPL-ing in small for a small amount of money, but also for a good SQ in a sealed enclosure. It has vent holes under centering spider, which is an interesting feature in this price range. For this amount of money not bad at all.

front rear vent hole terminal