耳機為何好快就一邊無聲?

由於電線經常屈折, 一些質素欠佳的耳機, 內裡銅線容易折斷.
以本人過往實際應用, 以 Sony 較耐用, 以下為較經濟選擇:
http://www.sonystyle.com.hk/ss/product/walkman/mdr_ex32sp_bq.jsp

2009-03-02 09:30:37 補充：
以本人觀察所知, 並非焊接不良所致, 而是電線內裡斷銅線所致, 一般最容易出現於近插頭及左右耳交接點, 建議收納時捲起不要捲太小的圈, 捲起時讓插頭自由, 不要緊縮.

It usually causes by bad contact or bad soldering of the Earphone jack in our radio, mp3 device or mobile devices.
For most of the case, it can be fixed by re-soldered the Earphone jack to the circuit board.


http://www.made-in-china.com/image/2f0j00tBJTPuZIbLbjM/2-5mm-Earphone-Jack-EJ-001-.jpg