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1、J I S CW5504 92 4933608 0509886 827 JIS UDC 621.395.623.7 JAPANESE INDUSTRIAL STANDARD Horn type loudspeakers Translated and Published by Japanese Standards Association Printed in Japan 9s Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/111111100
2、1, User=Wing, Bernie Not for Resale, 03/14/2007 19:44:49 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S C*5504 92 W 4933b08 OC09887 763 e In thc cvcnt of any doubt arising, thc original Standard in Japancsc is to be final authority. e Copyright Japanese Standards Ass
3、ociation Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 19:44:49 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S C*5504 92 4933608 0509888 bTT JAPANESE INDUSTRIAL STANDARD Horn type loudspeakers 1.
4、 Scope UDC 621.395.623.7 J I S C 5504-1992 This Japanese Industrial Standard specifies electrodynamic horn type loud- speakers, which are intended for use in general loudspeaker equipment of electrical communication apparatus (hereinafter referred to as the “loudspeakers“). Remarks 1. Loudspeaker me
5、ans an apparatus composed of horn and driving unit, hereinafter referred to as the “unit“, and a loudspeaker integrated in one body is called as “combination type“ and that whose horn and unit are separable is called as “separate type“. However, loudspeakers employing cone speaker as the driver are
6、excluded from application of this Standard. 2. The following Standards are cited in this Standard: JIS C O0 10-Basic Environmental Testing Procedures General and Guidance JIS Z 8703-Standard Atmospheric Conditions for Testing 2. Definitions bore of horn The outside diameter of horn opening. throat T
7、he sound path at the joint of horn and unit. reference point of loudspeaker on the plane passing the horn opening periphery. The geometric centre of horn opening reference axis of loudspeaker passing the horn opening periphery and passes the reference point. The straight line perpendicular to the pl
8、ane rated impedance This means the absolute value of input impedance assigned by the manufacturer for the purpose of matching of loudspeaker and amplifier and measurements, and expressed as the electrical impedance, in ohoms (a), at the input terminals (of voice coil or of primary side of matching t
9、rans. former being connected with the voice coil, if provided) at a frequency of 1 kHz. input impedance Z and input terminal voltage u by the equation given below, and is expressed in watts (W). It means the electric power P which is calculated from rated rated input to operate the loudspeaker appro
10、priately and is expressed in watts (W). This means the input which is assigned by the manufacturer Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 19:44:49 MDTNo reproduction or networking
11、permitted without license from IHS -,-,- J I S C*5504 92 M 4933b08 0509889 53b W Rated impedance of voice coil 2 C 5504-1992 I 4 8 16 32 48 output sound pressure frequency characteristic The frequency characteristic of sound pressure level measured at a point on the reference axis 1 m apart from the
12、 reference point when a constant sinusoidal voltage corresponding to an input of 1 W is applied to the input terminals of loudspeaker. output sound pressure level pressure levels at the appropriate frequencies prescribed in 3.5 in the characteristic of (8), and is expressed in decibels (dB). 2 x lom
13、5 Pa is taken as O dB. This means the average value of sound Provided that, reproducing frequency band level does not fall below the output sound pressure level of (8) by 20 dB The frequency band in which the sound pressure or more in the characteristic of 18). characteristic in this frequency band
14、is narrower than 1/9 octave, such trough is neglected. In the reproducing frequency band, the lower limit frequency shall be the lower threshold frequency (f) and the upper limit frequency shall be the higher threshold frequency ( f H ) . abnormal sound Unordinary sound which can be perceived on the
15、 reference axis at a distance of 1 m or more when the loudspeaker is driven by a programme signal of rated input. polarity of voice coil When a direct current is applied to a voice coil, if the coil moves along the direction of sound radiation, the terminal fed by plus side of the direct current is
16、called as (+) terminal, and that by minus side as (-1 terminal. If the trough of frequenci 3. Performance 3.1 Insulation resistance The insulation resistance shall be not less than 1 Mn between the voice coil and body, and not less than 10 Mn between the body and primary side of matching transformer
17、, if provided, when the test of 5.2.2 is carried out. 3.2 Voltage-proof No abnormality shall appear when the test of 5.2.3 is carried out. 3.3 Operation No abnormality shall appear when the test of 5.2.4 is carried out. 3.4 Rated impedance The value of rated impedance shall be within +, 15 % from th
18、e marked value when measured in accordance with 5.2.5. impedances of voice coil are classified into five kinds given in Table 1. The rated a a a a Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14
19、/2007 19:44:49 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S C*5504 92 M 4933608 0509890 258 M Rated input . 10 12 15 20 25 30 35 40 50 60 70 3 C 5504-1992 80 3.5 Output sound pressure level For loudspeakers with bore dimension of 200 mm or more, the average value o
20、f sound pressure levels measured at 4 frequencies Le. 500 Hz, 1 kHz, 1.5 kHz and 2 kHz shall be not less than 104 dB, and for those with bore dimension of less than 200 mm, the average value of sound pressure levels measured at 4 frequencies i.e. 1 kHz, 1.5 kHz, 2 kHz and 3 kHz shall be not less tha
21、n 98 dB, when the test of 5.2.6 is carried out, Provided that, the bore of modified shape loudspeaker shall be understood to correspond the bore of circular one with the same opening area. 3.6 Reproducing frequency band The loudspeaker shall satisfy the marked 3.7 reproducing frequency band when tes
22、ted in accordance with 5.2.6. subjected to the operation test in accordance with 5.2.4 and to the continuous loading test in accordance with 5.2.7 by applying the rated input to the loudspeaker. Rated input There shall be no abnormality when the loudspeaker is The values of rated input shall be the
23、values of twelve kinds given in Table .- 2 or the values of Table 2 multiplied by 1/10 or 10. Table 2. Rated input Unit: W 3.8 Resistance to vibration The loudspeaker shall be so constructed that it can sufficiently withstand the vibration expected in normal service condition and shall not show any
24、abnormality when subjected to the vibration test of 5.2.8. 3.9 Waterproof The loudspeaker shall be so constructed that it can withstand the rainfall expected in outdoor use, and the insulation resistance shall be not less than 1/10 of the respective value specified in 3.1 when the loudspeaker is sub
25、jected to the waterproof test of 5.2.9. 3.10 The loudspeaker shall be so constructed from suitable materials that it can withstand the high temperature expected in indoor and outdoor use, and shall not show any abnormality when subjected to the heat resistance test of 5.2.10. 3.11 Resistance to heat
26、 Resistance to cold The loudspeaker shall be so constructed from suitable materials that it can withstand the low temperature expected in indoor and outdoor use, and shall not show any abnormality when subjected to the cold resistance test Of 5.2.11. 4. Shape, dimensions and appearance 4.1 Appearanc
27、e General finish, assembly, etc. shall be in good state. 4.2 Dimensions The dimensions of horn bore, positions and dimensions of fixing holes of mounting metal fittings, dimensions of joint part and diameter of throat, and the tolerances thereon shall be as given in the following sub-clauses: (1) Di
28、mension of horn bore The dimension of horn bore shall be expressed by the dimension of outside diameter when the horn is circular, and by the dimensions of major axis and minor axis when modified shape, and the tolerances on the marked dimensions shall be as given in Table 3. Copyright Japanese Stan
29、dards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 19:44:49 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S C*5504 92 W 4933bO8 0509891 194 W - - Under 200 200 and over 4 C 5504-1992
30、I 5 5 3 Table 3. Tolerance on bore dimension d 10 to 16 10 to 16 8 to 12 6 to 10 Marked dimension mm I Tolerances 8 P Tolerances on p 102 2 1 51 38 25 +, 0.5 (2) Position and dimension of fixing hole of mounting metal fitting If the horn is equipped with an U-shaped mounting metal fitting, the posit
31、ions and dimensions of fixing holes shall be of the four kinds given in Table 4. Table 4. Position and dimension of fixing hole of mounting metal fitting Unit: mm i Horn mounting metal fitting LL type (3) Dimension of joint part thread shape, and the dimensions of such part shall be of the two class
32、es given in Table 5. combination type ones. The joint part of horn and unit shall have a However, this requirement does not apply to Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 19:44:49
33、 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S C*5504 72 4933608 0507872 O20 W a a a a 5 C 5504-1992 Table 5. Dimensions of joint part Unit: mm Details of joint part Joint Dart Unit Major diameter of external thread a Class 1 34.925 Class 2 Minor Length of diameter
34、of Pitch Pitch connecting external diameter part of thread horn d i d z P Hl 33.193 34.008 O 32.052 33.026 Length of connecting part of unit H 2 15 A (4) Diameter of throat The diameter of throat at the joint of horn and mit shall be 19 f 1.5 mm (refer to Table 5) does not apply to the combination t
35、ype ones. However, this requirement 4.3 Marking for polarity of voice coil terminals of vice coil terminals shall be made by symbols, color code or the like. The marking for polarity However, loudspeakers with matching transformer are exempted from this require- ment. 5. Tests 5.1 Test conditions 5.
36、1.1 Standard test condition Unless otherwise specified the tests shall be carried out under the ordinary temperature of 5 to 35“C, ordinary humidity of 45 to 85 % and air pressure of 86 to 106 kPa (temperature grade 15 (t 15“C), humidity grade 20 (t 20 %) of JIS Z 8703). If any doubt arises on the d
37、ecision the tests shall be carried out under a temperature of 20 5 2“C, a relative humidity of 60 to 70 %, and an air pressure of 86 to 106 kPa Symbol I grade 2 in 5.2 (referee condition) of JIS C 0010). Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Empl
38、oyees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 19:44:49 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S C*5504 92 M 4933b08 0509893 Tb7 6 C 5504-1992 5.1.2 Background noise and interference As a rule, the test results shall not be affected by the backg
39、round noise or other interference by 2 1 dB or more, irrespective of indoor or outdoor. 5.1.3 Measuring space The space for carrying out the test of 5.2.6 shall be such that the error at the point of measurement due to influence of reflection in a frequency band of 100 Hz to 10 kHz is, as a rule, wi
40、thin 2 1 dB. 5.1.4 Microphone The microphone for use in the measurement shall be a pressure-type electrostatic microphone the calibration values for sound field of which are known. 5.1.5 Standard horn For the test of units, the standard horn shall be used, as a rule (see Fig. 1). by employing a spec
41、ified horn or on the unit itself, but such a fact shall be clearly stated in the test results. If no doubt arises in the judgement, units may be tested Fig. 1. Standard horn Unit: mm -1 1 5.1.6 Automatic recording equipment When the measurement of output sound pressure frequency characteristic is ma
42、de by automatic recording equipment, the rate of frequency change shall be such that the rate of change is slow enough so that the test result will not deviate much from the measured value at steady state, and the difference between the indicated value and the indicated value at standstill shall be
43、not more than 1 dB. 5.1.7 Driving amplifier The performance of power amplifier which feeds the input to a loudspeaker shall, as a rule, satisfy the following requirements: e e e e Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=W
44、ing, Bernie Not for Resale, 03/14/2007 19:44:49 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S Cg5504 92 m 4933608 0509894 9T3 m 5.2 7 C 5504-1992 (1) The distortion factor, when an amplifier is generating an output corresponding to the rated input of loudspeaker wit
45、h the specified load being connected to the amplifier, shall be not more than 1 %. The variation of output voltage when the specified load is connected from that when a load corresponding to 10 times of the said load, shall be not more than 1 dB. If no doubt arises in judgement this condition may no
46、t necessarily be followed. (2) Test met hods 5.2.1 Test for appearance, dimensions and marking The dimensions of a loudspeaker shall be measured for those specified in 4.2 by using an appropriate dimensional measuring apparatus. required in 4.1 and 7. The appearance and marking shall be visually exa
47、mined on the particulars 5.2.2 Insulation resistance test The insulation resistance shall be measured between the body and voice coil with a d.c. 100 V insulation resistance tester, or between the body and primary side of matching transformer, if provided, with a d.c. 500 V insulation resistance tes
48、ter. 5.2.3 Voltage-proof test A.C. 100 V of power frequency is applied between the body and voice coil, or a.c. 500 V is applied between the body and primary side of matching transformer, if provided, for 1 min, and then whether any abnormality exists or not shall be examined in the test of 5.2.4. 5.2.4 Operation test A program signal whose maximum value is almost equal to the rated input of the loudspeaker shall be applied to the specimen as its input, and the volume, timbre, existence or nonexistence of noise or other abnorma