Economic Daily - China Economic Net Beijing September 10th 5th, Jiangsu Province Quality Supervision Bureau released the results of quality inspection of earphone products, this time a total of 28 batches of products, 9 batches failed, the failure rate was 32.1%.
The quality of the earphone directly affects our auditory effect on the sound quality. The spot check found that the difference in the frequency response of the two earphones of the eight batches of products is unqualified, which will seriously affect the auditory effect of the human ear on the sound quality; The electroacoustic conversion efficiency is too high, the sound pressure is too large, and it is easy to cause hearing damage to the human ear; the characteristic voltage items of the 2 batch products are unqualified, and the earphones are less loud under the driving of the mobile phone or the computer, and the desired effect is not achieved.
The quality supervision department advises consumers to carefully check the packaging instructions of the earphones and accessories, confirm whether the standard is executed, and the relevant specifications, technical specifications, such as rated impedance, sensitivity, total harmonic distortion, etc., and determine the matching with the earphone. Equipment used. Pay attention to check whether the appearance is smooth and the workmanship is fine. Pay attention to the auxiliary wire of the earphone. In theory, the purity of the copper wire of the earphone wire determines the strength of the wire, which will affect the distortion of the signal. When you buy, you can bend the wire by hand. When the normal copper wire is bent, you can't feel the presence of metal. Different earphones have different characteristics. If there is a sound source for audition, try to bring the sound source, listen to the scene, choose the right one. The best way to buy the original model of the headset, mismatched with different impedance, the earphones of the metrics will cause irreversible damage to the human ear.
"Economic Daily - China Economic Net 》 Original link http://www.ce.cn/cysc/zgjd/jdsh/201809/10/t20180910_30255710.shtml
