Visaton FR 87 4 Ω
8.7 cm (3.4") fullrange speaker with balanced frequency response and high efficiency. For speech and music reproduction in electronic divices and vehicles.
| Brand | Visaton |
| Model | FR 87 4 Ω |
| Kind | Full range |
| Nominal diameter (mm) | 87 |
| Impedance (Ω) | 4 |
| Rated power (W) | 15 |
| Maximum power (W) | 20 |
| Sensitivity (dB, 1 W/1 m) | 85 |
| Frequency response | 100 Hz – 20000 Hz |
| Resonance frequency, fs (Hz) | 137 |
| DC resistance, Re (Ω) | 3.5 |
| Mechanical Q, Qms | 6.4 |
| Electrical Q, Qes | 1.56 |
| Total Q, Qts | 1.25 |
| Equivalent volume, Vas (l) | 1.3 |
| Effective piston area, Sd (cm²) | 37 |
| Moving mass, Mms (g) | 2 |
| Force factor, BL (T·m) | 2.1 |
| Voice coil inductance, Le (mH) | 0.2 |
| Linear excursion, Xmax (mm) | |
| Excursion limit, Xmech (mm) | 2 |
| Voice coil diameter (mm) | 15 |
| Cutout diameter (mm) | 80 |
| Mounting depth (mm) | |
| Cone material | |
| Magnet material | |
| Weight (kg) | 0.21 |