求教leach amp接地問題？

[amp168]

請教各位大大：
我的雙快槍有些微哼聲，查看leach amp的組裝說明有段關於如何解決哼聲的方法，全文如下：1.Turn the amplifier off and wait for the power supply to discharge. Do not perform this procedure with the amplifier on.
2.Cut the wire to the central ground on the input side of one circuit board.
3.Solder a short circuit jumper wire between the ground lugs on the two input jacks.
4.The circuit board with the cut ground wire is now grounded back through its input ground lead to the ground of the other circuit board. Use an ohmmeter to verify the new ground connection before turning the amp back on.
請問他的意思是不是將兩塊電路板輸入端的中點接地剪斷一條(一塊板子輸入端接終點接地，一塊板子輸入端不接，再用一條跳線將鎖在背板的左右輸入端子的接地點連接起來。不知哪位大大可否畫圖說故事替小的解答，謝謝！

[TJJ]

其實另外的方法是用電表線夾電源接地或輸入接地, 在機殼內四處點點看, 聽哼聲的變化, 找到最佳點再將機殼接地移到那點