Carpower SP-252C

Autohifi subwoofer

Manufacturer parameters
  • Diameter: 10" (25cm)
  • Power (W): 100/350
  • Impedance (Ohm): 4
  • Sensitivity (db/1W): 93
  • Qts: 0.41
  • Price: 25

  • Diaphragm: coated paper
  • Basket: sheet steel
  • Magnet: 850g single (diameter 12,66cm)
Measured parameters
  • Fs = 33.07 Hz
  • Re = 3.70 ohms[dc]
  • Le = 375.81 uH
  • Qt = 0.39
  • Qes = 0.45
  • Qms = 3.19
  • Mms = 38.87 grams
  • Rms = 2.534241 kg/s
  • Cms = 0.000596 m/N
  • Vas = 98.51 liters
  • Sd= 343.07 cm^2
  • Bl = 8.157032 Tm
  • ETA = 0.76 %
  • Lp(2.83V/1m) = 94.28 dB (92.1dB/1W)


SP-252C from Monacor's Carpower brand is a driver, where you can see manufacturers effort to save cost. Primarily on that funny violet foam suspension, but also on the white sheet steel basket and cheap terminal. However there was not that much effort to save on the motor, diameter of the magnet is 12.5cm, which is not bad for 10" woofer. Coate paper cone looks quite good, too. Rear pole is not drilled, only vent holes are in the cone under the dustcap, that's why the rated input power is just a moderate 100W. TS parameters are well balanced, driver is suitable for bass-reflex and bandpass enclosures.