Specification:

1, SIZE: D50mm * H20mm

2, Nominal Impedance: 4Ω±15% at 1KHZ,1.0V (D.C.R=4.5Ω±10%)

3, Input Power Nom. Input 12W,  Max. Input 18 W

4, Operation 4.90Volt (200Hz-20KHz) Sweep Time at 2s

5, Resomant FerQ. F0: 220 ± 20% HZ (F0 Meter)

6, Flux Density 11500GAUSS ± 10%

7, Insulation Resistance No Less than 1M at DC 100V

8,Polarity: 

When positive voltage is applied to the (+) Terminal, V oice

Coil should move out to of the Air gap.

9. Weight 90g ± 10% (Driver weight)

10. Power Test IEC 268-5 6.93V 48 Hours

11. Heat Resistance

Temperature: +60℃ ± 2℃

Duration: 24 hours

12. Humidity Resistance

Temperature: + 40℃ ± 2℃

Relative Humidity: 93(+2/-3)%

Duration: 48 Hours(GB)

13. Low Resistance

Temperature: -10℃ ± 3℃ testing 1 Hours (GB)

And then -20℃± 3℃ testing 2 Hours(GB)

14. Dropping Test 600±25mm 60°±5° (GB)