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FR 87 - 4 Ohm

Art. No. 4630

8.7 cm (3.4") fullrange speaker with balanced frequency response and high efficiency. For speech and music reproduction in electronic divices and vehicles.

Typical applications

  • Monitoring speaker for electronic devices
  • Vehicles
  • Electronic musical instruments


  • Moisture-resistant membrane
  • Metal basket
*Gross price for private customers. Industrial prices are available on request.
Technical Data
Amplitude & Impedance Frequency
Directivity pattern
Rated power 15 W
Maximum power 20 W
Nominal impedance Z 4 Ohm
Frequency response 100–20000 Hz
Mean sound pressure level 85 dB (1 W/1 m)
Opening angle (-6 dB) 143°/4000 Hz
Excursion limit +/−2 mm
Resonance frequency fs 137 Hz
Height of front pole-plate 3 mm
Voice coil diameter 15 mm
Height of winding 4.3 mm
Cutout diameter 80 mm
Net weight 0.21 kg
D.C. resistance Rdc 3.5 Ohm
Mechanical Q factor Qms 6.4
Electrical Q factor Qes 1.56
Total Q factor Qts 1.25
Equivalent volume Vas 1.3 l
Effective piston area Sd 37 cm²
Dynamically moved mass Mms 2 g
Force factor Bxl 2.1 Tm
Inductance of the voice coil L 0.2 mH
Connections 4.8 x 0.8 mm (+)/2.8 x 0.8 mm (-)
Temperature range –25 ... 70 °C

Used in / Accessories:


Protective grille made of black plastics. Can be supplied painted in other colours on request.

- Suitable for: FR 87, SL 87 WPM

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