FR 7 - 4 Ohm

Art. No. 2015

6.5 cm (2.5") full-range speaker with minimal mounting depth and small magnet. Balanced frequency response and high efficiency. Very good high range response. Suitable in machines and other equipment where space is at a premium.

Typical applications
Narrow network column speakers
Monitoring speaker for electronic devices
Model construction
Electronic musical instruments
  • Moisturised cone
  • Metal basket

Technical Data

Rated power
5 W
Maximum power
10 W
Nominal impedance Z
4 Ohm
Frequency response
130–20000 Hz
Mean sound pressure level
86 dB (1 W/1 m)
Opening angle (-6 dB)
180°/4000 Hz
Excursion limit
+/−1 mm
Resonance frequency fs
220 Hz
Height of front pole-plate
2.5 mm
Voice coil diameter
14 mm
Height of winding
2.5 mm
Cutout diameter
61 mm
Net weight
0.092 kg
D.C. resistance Rdc
3.4 Ohm
Mechanical Q factor Qms
Electrical Q factor Qes
Total Q factor Qts
Equivalent volume Vas
0.4 l
Effective piston area Sd
22 cm²
Dynamically moved mass Mms
1.0 g
Force factor Bxl
1.1 Tm
Inductance of the voice coil L
0.1 mH
Temperature range
–25 ... 70 °C
Frequency- and impedance response
Directivity pattern