1. model: 23cr08fh-50nd

1. model: 23cr08fh-50nd
1.
MODEL:
2
Dimension & Weight
23CR08FH-50ND
23φ mm
Outer Diameter
20.1φ
Baffle Opening
Height
3
Magnet
4.
Nominal Impedance
5.
Power Rating
6.
Resonant Frequency
7.
Output Sound Pressure
Frequency Range
9.
Distortion
Normal
0.5 Watts
Normal
Watts
Maximum
800,
400
5
~
Must be Normal Tested By
11
White Noise
12 Polarity
0.5
1000,
Watt . 0.5 Meter
1200,
1500 Hz.
20000 Hz. Average SPL − 10 db.
% Maximum At
2.0
Watts Square Wave.
± 20 % Hz.
± 3 db/
Average at
1500 Hz.
Maximum 1.0 Watts Sine Wave.
670
81
4.0Grams
φ 9.5 ×1.5 mm
Size
Ω ± 15 %, At
10 Abnormal Sound test
Load Test
Weight
Rare Earth
8
Lever (S.P.L.)
8.
mm
Refer to drawing
Materials
20.1φ mm
Face side Dimension
2.0
Volts. (RMS.)
1000 Hz.
0.5 W.
Volts. Sine Wave.
96
Hours.
Diaphragm shall move Forward while Apply a Positive DC Signal to the " +
" or " Marked " Terminal.
Above Measuring condition under temperature : 25~35℃ R.H. 25 ~75%. According to standard
GB/T9396-1996
Mechanical and vibration test
13 High Temperature
+ 60 ± 2 °C
Humidity Random for 96 Hours. (GB2423.2-81)
14 Low Temperature
− 25 ± 2 °C
Humidity Random for 96 Hours. (GB2423.1-81)
15 Humidity
+ 40 ± 2 °C
Relative Humidity (RH) 90 ∼ 95 % 96 Hours.
16 Vibration
Frequency 30 ± 15 Hz, Amplitude 1.5 mm for 3 Hours. (GB11606.8-89)
17 Drop test
75 CM free falling on Concrete floor, 10 times. (GB2423. 8-81)
After test leave speakers at room temperature for 1 hour, SPL shall not deviate by ± 3 db from pre-test
18 Temperature Cycle test
− 25 ∼ + 60 °C
4 Cycles Temperature test. (GB5170.18-87)
After test leave speakers at room temperature for 1 hour, SPL shall not deviate by ± 4 db from pre-test
Measurement, and meet above spec. item
6. 7. 8. 9. 10.
Please refer to next pages for more detailed testing method.
Test method and User precaution.
1.
Characteristics measured according to standard GB/T 9396-1996
1.1
Except other specified, measuring are under Temperature 25~35℃ R.H. 25 ~75%
1.2.
Judgement condition Temperature 20 ±2 R.H. 63~67%
2.
Output Sound Pressure Level (S.P.L.) and distortion testing setup
3.
Environment & Mechanical test:
3.1 High Temperature: GB2423.2-81
After exposure the speaker in the + 60 ± 2 °C chamber for 96 hours, then leave the
speaker at room temperature for 1 hour, the SPL should not deviate by ± 3 db, and
resonant frequency should not deviate by ± 50 Hz, compare with pre-test measurement.
3.2 Low Temperature: GB2423.1-81
After exposure the speaker in the −25 ± 2 °C chamber for 96 hours, then leave the
speaker at room temperature for 1 hour, the SPL should not deviate by ± 3 db, and
resonant frequency should not deviate by ± 50 Hz, compare with pre-test measurement.
3.3 Temperature cycle: GB5170.18-87
After exposure the speaker in the chamber, temperature cycle setting as below shows,
SPL should not deviate by ± 4 db, and resonant frequency should not deviate by ± 80 Hz,
compare with pre-test measurement.
3.4 Humidity: GB5170.18-87
After exposure the speaker in the + 40±2 °C, relative humidity 90% ∼ 95% chamber for 96
hours, then leave the speaker at room temperature for 6 hours, the SPL should not
deviate by ±3 db, and resonant frequency should not deviate by ±50 Hz, compare with
pre-test measurement.
3.5 Vibration: GB11606.8-89
Frequency 30±15 Hz, Amplitude 1.5 mm for 3 Hours. After test, SPL shall not deviate by
±3 db from pre-test measurement,
3.6 Load test: GB/T 9396-1996
Speaker should not fail after apply 20 ∼ 20K Hz white noise rated power input (RMS), 96
hours. After test, SPL shall not deviate by ±3 db from pre-test measurement,
3.7 Drop test: GB2423. 8-81
75 cm free falling on concrete floor, 10 times. After test, SPL shall not deviate by ±3 db
from pre-test measurement,
4.
Mounting precaution
In order to keep speaker work normally, there shall leave enough free space for diaphragm
moving, minimum distance required is marked in speaker mechanical drawing.
5.
Measuring & standard referenced
Abstract from GB/T 9396-1996 and IEC 268-5:1989 methods of measurement for
main characteristics of loud speakers.
5.1 Maximum input voltage
Maximum input voltage is in the shortest time. The speaker can bear simulation signal,
that persist time is 1 second, interval 60 seconds, repeated 60 times, but the speaker
wouldn’t be damaged externally. The maximum signal voltage is the maximum input
voltage in/the shortest time.
5.2 Rated sine voltage.
It is stipulated by manufacturer, sine signal voltage that make speaker work continuously
in rated frequency range, but the speaker wouldn’t be damaged heartily or mechanically.
The persist time of the voltage is 1 hour.
5.3 The shortest time maximum power.
It is corresponding with the shortest time maximum input voltage, its definition is Ust2/R,
Ust indicates the shortest input power, R indicates the rated impedance.
5.4 The long time maximum power.
The long time maximum power is corresponding with the ling time maximum input voltage,
Its definition is Ult2/R, Ult indicates the long time maximum input voltage, R indicates the
rated impedance.
5.5 The rated sine power.
The rated sine power is corresponding with the rated sine voltage, its definition is Us2/R,
Us indicates the maximum sin voltage, R indicates the rated impedance.
5.6 The rated noise power.
The rated noise power is corresponding with the rated noise voltage, its definition is Un2/R,
Un indicates the rated noise voltage, R indicates the rated impedance.
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