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FRS 7 - 4 Ohm

Art. No. 2011

6.5 cm (2.5") fullrange speaker with balanced frequency response and very good highs. Especially suitable as built-in speaker for music reproduction and as driver for 100 V network column speakers. Outstandingly high efficiency compared to the small size.

*) IP protection class for front side when built into a sealed enclosure (gluing of the loudspeaker and a front cover (grille) might be necessary)

Typical applications

  • Narrow network column speakers
  • Monitoring speaker for electronic devices
  • Model construction
  • Electronic musical instruments


  • Waterproof membrane
  • metal design
  • 100 °C temperature resistant
*Gross price for private customers. Industrial prices are available on request.
Technical Data
Amplitude & Impedance Frequency
Directivity pattern
Rated power 8 W
Maximum power 15 W
Nominal impedance Z 4 Ohm
Frequency response 200–20000 Hz
Mean sound pressure level 88 dB (1 W/1 m)
Opening angle (-6 dB) 149°/4000 Hz
Excursion limit +/−1.5 mm
Resonance frequency fs 220 Hz
Magnetic induction 1.2 T
Magnetic flux 160 µWb
Height of front pole-plate 2 mm
Voice coil diameter 14 mm
Height of winding 3.5 mm
Cutout diameter 61 mm
Net weight 0.2 kg
D.C. resistance Rdc 3.6 Ohm
Mechanical Q factor Qms 3.21
Electrical Q factor Qes 1.96
Total Q factor Qts 1.22
Equivalent volume Vas 0.3 l
Effective piston area Sd 22 cm²
Dynamically moved mass Mms 0.8 g
Force factor Bxl 1.7 Tm
Inductance of the voice coil L 0.3 mH
Connections 2.8 x 0.5 mm (+)/2.8 x 0.5 mm (-)
Protective system IP 64 *)
Temperature range -40 ... 100 °C

Used in / Accessories:


Protective grille made of black painted metal. Decoration ring made of black plastics. Can be supplied painted in other colours on request. Attributes: - Plastics: ABS

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