| ITEM |
|
SPECIFICATIONS |
| 1 |
Type |
Dynamic speaker |
| 2 |
Dimension |
External diameter 25*15 mm |
| 3 |
Rated Input Power |
0.25 W |
| 4 |
Impedance |
8 ohm ± 15% at 2KHz |
| 5 |
Resonance Frequency (Fo) |
900 Hz ± 20% at Fo, 1V |
| 6 |
Sensitivity (S.P.L.) |
77dB(W/m) ± 3 dB at AVE 1.0K,1.2K,1.5K,1.8K(Hz). |
| |
|
90dB(0.25W/0.1m) ± 3 dB |
| 7 |
Frequency Range |
Fo – 15KHz |
| 8 |
Total Harmonics Distortion |
Less than 8 % at 1KHz,1.0V. |
| 9 |
Max. Input Power |
Must be normal at 0.5W white noise for 1 minute. |
| 10 |
Voice Coil |
Diameter 9.0 mm |
| 11 |
Magnet |
Rare earth permanent (Nd-Fe-B) magnet Φ8.0 x 1.0 mm |
| 12 |
Weight |
2.3g ± 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 –0.25W |
| 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 |
Temperature |
Operating temperature: -20℃ to +60℃ |
| |
|
Storage temperature: -30℃ to +70℃ |
