Weird audio problem.

I have both my computer and my ipod hooked up to the same speakers using a (fairly high quality) splitter cable. Usually if i turn up my speakers full blast without audio playing there isnt any hum or buzzing. However, i noticed that when my ipod is plugged in to the speakers there is a buzzing sound if i turn up the speakers enough.
I tried various things to fix this problem, and nothing worked. I used one of those ferrite cores around the audio cable to reduce interference but it didnt work.
I noticed that the following things got rid of the buzzing:
-Having the nano plugged in both USB and audio, but removing the audio in from the PC
-OR unplugging the USB cord from the nano
It seems that by having my iPod plugged in through USB and audio and having my PC plugged in to the speakers gives this interference.
Does anyone know what this problem is? Has anyone had this problem? And does anyone know how to solve this problem?

Yeah, a ground loop is probably the cause of the buzzing. As the name suggests, this is when the ground lines are connected into a loop.
When you have this loop, the magnetic fields around you generate a current in the cables which will be heard as a humming or buzzing.
Your loop seems to be: Computer -> splitter -> iPod -> Computer
Cutting the loop (by disconnecting one of the cables) will remove the buzzing.
If you absolutely must have everything connected, you should be able to reduce the buzzing by reducing the area of the loop and twist the USB and audio cables around each other.

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Message was edited by: blotch

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Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
While logged in as Guest, you won’t have access to any of your documents or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this behavior; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
*Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.
Step 2
The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Please take this step regardless of the results of Step 1.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of Steps 1 and 2.

Weird audio problem.

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