VISATON FR 87 - 4 Ohm
4Ω
Full-range
| Nominal diameter | 3.4″ / 87 mm |
| Resonance | 137 Hz |
| Q factor | 1.25 |
| Sensitivity | 87.7 dB |
| Linear excursion | ± 0.6 mm |
| Program Power | 20 W |
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Specifications
- Sensitivity (1W, 1m, infinite baffle) SPL1W 87.7dB
- Frequency response 100 - 20000Hz
Thiele & Small parameters
- Resonance frequency (free air) fS 137Hz
- Mechanical quality factor QMS 6.40
- Electrical quality factor QES 1.56
- Total quality factor QTS 1.25
Large signal parameters
- Maximum linear excursion (one way) xmax 0.6mm
- Maximum excursion before damage xlim 2mm
- Air volume displaced at xmax VD 2.2cm³
- Power handling P 15W
- Program power Pmax 20W
Voice Coil
- Nominal impedance Z 4Ω
- DC resistance RE 3.5Ω
- Inductance (1kHz) LE 0.2mH
- VC Diameter 15mm
- Winding height HVC 4.3mm
Magnet
- Force factor Bl 2.1N/A
- Motor constant Bl/√RE 1.12N/√W
- Air gap height HAG 3mm
Diaphragm
- Effective diameter 69mm
- Effective area SD 37cm²
- Moving mass MMS 2g
- Moving mass (without air load) MMD 1.8g
Suspensions
- Stiffness KMS 1.49N/mm
- Compliance CMS 670µm/N
- Equivalent volume to the compliance VAS 1.3L
- Mechanical resistance RMS 0.27N·s/m
Dimensions
- Nominal diameter 3.4″
- 87mm
- Baffle cutout diameter 80mm
- Net weight 0.21kg
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