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:
- Control speaker for electronic devices
- Vehicles
- Electronic musical instruments

Attributes:
- Moisturised cone
- Metal basket

Used in / Accessories:
GRILLE FR 87

sketch

frequency- and impedance response

Technical Data:
Rated power	10 W
Maximum power	15 W
Nominal impedance Z	4 Ohm
Frequency response	100–20000 Hz
Mean sound pressure level	85 dB (1 W/1 m)
Angle of sound emmision	143°/4000 Hz
Maximum cone displacement	+/−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
Heat resistance	−25 ... 70 °C

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directivity pattern

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