| 1 |
Type |
Black mylar diaphragm speaker |
| 2 |
Dimension |
External diameter 28 mm |
| 3 |
Rated Input Power |
0.3W |
| 4 |
Impedance |
8 ohm ± 15% at 1500KHz |
| 5 |
Resonance Frequency (Fo) |
480 Hz ± 20% at Fo,1V |
| 6 |
Sensitivity (S.P.L.) |
79dB/W(m) ± 3dB at AVE 1.0, 1.2K, 1.5K, 1.8K, (Hz) |
| 7 |
Sound Pressure Level |
93dB/0.3W(0.1m) |
| 8 |
Frequency Range |
Fo – 20 KHz |
| 9 |
Distortion |
5% Lessthan 0.3W 1500Hz Morethan |
| 10 |
Max. Input Power |
Must be normal at 0.6W white noise for 1 minute. |
| 11 |
Voice Coil |
Diameter 11 mm |
| 12 |
Magnet |
Rare earth permanent (Nd-Fe-B)Magnet 9.5 x 1.5 mm |
| 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 –0.3 W |
| 15 |
Buzz, Rattle, etc. |
Should not be audible at 1.55V sine wave between Fo Hz to
20KHz |
| 16 |
Polarity |
When positive voltage is applied to the terminal marked (+),
diaphragm should move to the front. |
| 17 |
Terminal Strength |
Capable of withstanding 1 kg load for 30 seconds without resulting
in any damage or rejection. |
| 18 |
Load Test |
Must be normal after load test:white noisc 0.3W 24 hours |
| 19 |
High Temp. Test |
Must be normal after 70±2℃ and relative humidity 20~25% 24
hours and then room temperature 1 hours |
| 20 |
Low Temp. Test |
Must be normal after -25±3℃ and relative humidity 20~25% 16
hours and then room temperature 1 hours |
| 21 |
Humidity Test |
Must be normal after 40±2℃ and relative humidity 20~25% 24
hours and then room temperature 1 hours |
| 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 tests listed on test 13 and 15 |
