SC 4.7 ND - 4 Ohm

Art. No. 8047

Magnetically shielded 4 x 7 cm (1.6" x 2.8") fullrange driver with good efficiency and balanced frequency response with a clear highrange reproduction. Extremely small size due to a neodymium magnet system. Applicable as built-in speaker in TV's and PC's with very small mounting space.

Typical applications
Video monitoring screens
Monitoring speaker for electronic devices
  • Moisturised cone
  • Metal basket
  • Magnetically shielded

Technical Data

Rated power
2 W
Maximum power
4 W
Nominal impedance Z
4 Ohm
Frequency response
220–20000 Hz
Mean sound pressure level
81 dB (1 W/1 m)
Opening angle (-6 dB)
180°/4000 Hz hor.180°/4000 Hz ver.
Excursion limit
+/−0.5 mm
Resonance frequency fs
360 Hz
Magnetic induction
0.7 T
Magnetic flux
60 µWb
Height of front pole-plate
2 mm
Voice coil diameter
14 mm
Height of winding
2 mm
Cutout diameter
35 x 65 mm (oval)
Net weight
0.041 kg
D.C. resistance Rdc
3.6 Ohm
Mechanical Q factor Qms
Electrical Q factor Qes
Total Q factor Qts
Equivalent volume Vas
0.18 l
Effective piston area Sd
16 cm²
Dynamically moved mass Mms
0.6 g
Force factor Bxl
0.9 Tm
Inductance of the voice coil L
0.2 mH
4.8 x 0.5 mm (+)2.8 x 0.5 mm (−)
Temperature range
–25 ... 70 °C
Frequency- and impedance response
Directivity pattern
Directivity pattern