1. Used RCA connectors by Taiwan, which is made of copper-plated plug,

 metal shell, and advantages of metal shell can be shielded from external

 interference.

2. Used genuine 99.9999% high purity oxygen-free copper audio signal lines ,

 which specifically designed for audio equipment and music equipment . This

 line have a more high toughness engineering plastics than others , it can

 improve the resilience and shielding properties . It has excellent shield

 performance and the effection of sound is particularly strong .

3.Use containing 3% silver Senju solders soldering.