I suggest you to unplug your equipments one by one (e.g. sub-woofer, tv, cableTV receiver etc), and see whether the problem disappeared after removing.
Also only plug in those interconnect cables from CD player -> Preamp -> Power Amp only and unplug others to test so as to isolate the problem.
If the hum sound still exists after these process, you can try to remove the ground from the power amp to do the test again.
The following are some information for your ref
http://www.epanorama.net/documents/groundloop/
Products that reduce hum (but you need to identify the problem source)
http://www.21best.com/21_best/electronic/security/video/filters/for_sale_.html作者: why 時間: 2006-4-21 22:26 標題: Thanks 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.作者: william 時間: 2006-4-21 23:42
Why,
That's great!
It will be the best if you can have a direct power from MCB
However, do you need to make it as "明線"?作者: why 時間: 2006-4-22 11:26 標題: To William Hi, William,
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.作者: TWM 時間: 2006-6-16 16:40
Anybody tried this CCS in your GG? Please share your experience and result.作者: louisla 時間: 2006-7-12 23:43 標題: GG PRE Hi, 我想問下GG的 22u 去交連電容是否好重要? 可否用100u ? 這個位置是否一定要好靚料? 或者這個電容是否對音色有很大的影響呢??作者: why 時間: 2006-8-9 02:49 標題: Later Photo 完成多時,加上開關指示燈,感到較靚仔。作者: cyrus 時間: 2007-11-28 12:12
Dear brother Why,
It looks great! I want to have a case like this, can you pls advise where you find this case with the price? Thanks.