| 1 |
Type |
Natural mylar dynamic speaker |
| 2 |
Dimension |
External diameter 29.0 mm |
| 3 |
Rated Input Power |
0.25W |
| 4 |
Impedance |
8ohm ± 15% at 1000Hz |
| 5 |
Resonance Frequency (Fo) |
700 Hz ± 25% at Fo, 1V |
| 6 |
Sensitivity (S.P.L.) |
83dB(W/m) ± 3 dB at AVE 1.0K,1.2K,1.5K,1.8K(Hz). |
| |
|
96dB(0.25W/0.1m) ± 3 dB |
| 7 |
Frequency Range |
Fo – 3.3KHz |
| 8 |
Distortion |
Less than 10 % at 1000Hz 0.25 W |
| 9 |
Max. Input Power |
Must be normal at 0.5 W white noise for 1 minute. |
| 10 |
Voice Coil |
Diameter 6.0 mm |
| 11 |
Magnet |
Rare earth permanent (Nd-Fe-B) magnet Φ5.0 x 0.5 mm |
| 12 |
Weight |
11g ± 5% |
| 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 –0.25W |
| 15 |
Buzz, Rattle, etc. |
Should not be audible at 1.41V 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 |
0.25 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. |
| 22 |
Drop Test |
Drop the speakers contained in normal box onto the board 20mm thick
10 times from the height of 0.75m and then should satisfy the test
listed on item 13 and 15 |
