4 x 9 cm (1.6" x 3.5") full-range speaker with wooden cone and stable plastic basket. Flat and lightweight design because of neodymium. The cooperation of the separate components leads to a very linear frequency response up to deepest frequencies by way of comparison, so that the loudspeaker can be also used in miniature hi-fi speakers.
Technical Data:
| Rated power | 4 W |
|---|
| Maximum power | 5 W |
| Nominal impedance Z | 8 Ohm |
| Frequency response | 120–20000 Hz |
| Mean sound pressure level | 83 dB (1 W/1 m) |
| Excursion limit | +/- 1 mm |
| Resonance frequency fs | 220 Hz |
| Magnetic induction | 1,15 T |
| Magnetic flux | 184 µWb |
| Height of front pole-plate | 2 mm |
| Voice coil diameter | 25,5 mm |
| Height of winding | 2 mm |
| Cutout diameter | 36 x 86 mm |
| Net weight | 0,054 kg |
| D.C. resistance Rdc | 6,9 Ohm |
| Mechanical Q factor Qms | 3,06 |
| Electrical Q factor Qes | 2,29 |
| Total Q factor Qts | 1,31 |
| Equivalent volume Vas | 0,43 l |
| Effective piston area Sd | 23,5 cm² |
| Dynamically moved mass Mms | 0,9 g |
| Force factor Bxl | 1,98 Tm |
| Inductance of the voice coil L | 0,13 mH |
| Protective system | IP 63 *) |
| Temperature range | −25 ... +70 °C |
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