Dear William,
Thanks a lot!
I have test one by one. I found if I directly connect to socket in wall, the noise became more loudly. So, I think that those noise comes from the power.
I have made appointment with the decorate worker of my home, he will come to my home to design a direct line for my HI FI components.
Unexpectly,I found two free pipes in a socket, they are also at the side near the General Switch Boaard. My decorater said that we may use them again, but all will be subject to the last check tommorow.
Thanks.