| 1 |
Type |
Dynamic speaker |
| 2 |
Dimension |
External diameter 20 mm |
| 3 |
Rated Input Power |
0.3 W |
| 4 |
Impedance |
8 ohm ± 15% at 1000Hz |
| 5 |
Resonance Frequency (Fo) |
600 Hz ± 20% at Fo, 1V |
| 6 |
Sensitivity (S.P.L.) |
74dB(W/m) ± 3 dB at AVE 1.0K,1.2K,1.5K,1.8K(Hz). |
| |
|
90dB(0.3W/0.1m) ± 3 dB |
| 7 |
Frequency Range |
Fo – 20KHz |
| 8 |
Distortion |
Less than 10 % at 1500Hz 0.3 W |
| 9 |
Max. Input Power |
Must be normal at 0.5W white noise for 1 minute. |
| 10 |
Voice Coil |
Diameter 9 mm |
| 11 |
Magnet |
Rare earth permanent (Nd-Fe-B) magnet Φ8.0 x 1.0mm |
| 12 |
Weight |
2.4g ± 0.3g |
| 13 |
Appearance |
Should not exist any obstacle to be harmful to normal operation;
damages, cracks, rusts and distortions, etc. |
| 14 |
Operation Test |
Must be normal at program source –0.3W |
| 15 |
Buzz, Rattle, etc. |
Should not be audible at 1.55V sine Wave between Fo to 20KHz |
| 16 |
Polarity |
When positive voltage is applied to the terminal marked (+), diaphragm
should move to the front. |
| 17 |
Terminal Strength |
Capable of withstand 1kg load for 30 seconds without resulting in
any damage or rejection. |
| 18 |
Load Test |
0.3 W white noise is applied for 96 hours and satisfy the test listed
on item 05,06,13,15 |
| 19 |
High Temp. Test |
Keep 96 hours at +70℃±3℃ and leave 3 hours in normal temperature
and then check |
| 20 |
Low Temp. Test |
Keep 96 hours at -20℃±3℃ and leave 3 hours in normal temperature
and then check |
| 21 |
Humidity Test |
Keep 96 hours at + 60℃±3℃ relative humidity 95% and leave 3 hours
in normal temperature and then checked. |
