Monacor SP-60

HiFi midbass driver

Manufacturer parameters
  • Diameter: 4" (10cm)
  • Power (W): 30 / 60
  • Impedance (Ohm): 4 / 8
  • Sensitivity (db/1W): 90
  • Qts: 0.49
  • Price: 10

  • Diaphragm: paper
  • Basket: sheet steel
  • Magnet: single, 8,1cm Diameter
Measured parameters

8Ohm
  • Fs = 76.09 Hz
  • Re = 7.10 ohms[dc]
  • Le = 381.27 uH
  • Qt = 0.43
  • Qes = 0.55
  • Qms = 1.89
  • Mms = 8.00 grams
  • Rms = 2.025038 kg/s
  • Cms = 0.000547 m/N
  • Vas = 1.94 liters
  • Sd= 50.27 cm^2
  • Bl = 7.008970 Tm
  • ETA = 0.15 %
  • Lp(2.83V/1m) = 84.34 dB


4Ohm
  • Fs = 75.01 Hz
  • Re = 3.60 ohms[dc]
  • Le = 212.43 uH
  • Qt = 0.38
  • Qes = 0.47
  • Qms = 1.88
  • Mms = 6.35 grams
  • Rms = 1.587110 kg/s
  • Cms = 0.000710 m/N
  • Vas = 2.52 liters
  • Sd= 50.27 cm^2
  • Bl = 4.779402 Tm
  • ETA = 0.22 %
  • Lp(2.83V/1m) = 88.93 dB (86.7dB/1W)


Tiny cheap midbass. Doesn't look that great from the front - ordinary paper cone and foam suspension in a weird shade of grey. But when you look at it from the rear, you'll be amazed by a huge magnet with a 8.1cm diameter (that's a lot for a driver of this size), which is a size of a magnet of some 5" or even 6.5" midbass drivers. It even has a drilled rear pole-piece. Sad thing was that I could not get a resonance as low as the manufacturer claims, the lowest I got in 8 drivers I had was 65Hz. Not that great to be used as a standalone midbass, but it's quite good as a midbass in a satellite speaker supported by a subwoofer. Another good thing is relatively low Qts, so you can create a box with nicely flat bass response. Sensitivity is not bad for the size, too.
However these parameters were measured after just a couple of hours of burn-in, so they might change after some serious time in use.