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.

Typical applications
Narrow network column speakers
Monitoring speaker for electronic devices
Model construction
Electronic musical instruments
  • Waterproof cone
  • Metal basket
  • 100 °C temperature resistant

Technical Data

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
250 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
Electrical Q factor Qes
Total Q factor Qts
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
Temperature range
-40 ... 100 °C
Frequency- and impedance response
Directivity pattern