"Squelchy" noise from external speakers plugged into headphone jack

I get a strange, warmly, high pitched static continuous "squelchy" noise from my external powered speakers when I have them plugged in via cable to the headphone jack of my iPad (3rd gen). The noise occurs only with the iPad - the noise is not present with other devices, such as my iPhone 4S, older iPhone 3G, or my Samsung Galaxy or Toshiba Thriven (both Android devices). Also, the noise is present only with external speakers - never with headphones. Doesn't happen with Bluetooth audio.
The pitch of the squelchy noise seems to be related to how much load the iPad processor is under, though I can't say for sure. I honestly have no idea why it's making this noise. I thought it might be a ground loop issue which occurred only when I had external powered speakers plugged in while the iPad was also plugged in, but the noise happens when the iPad is running on battery, as well.
Does anyone have any ideas how I might get rid of this noise?

I don't know if this could be your problem, but...
On some systems the BIOS will sometimes disable the on-board audio controller at startup if it doesn't detect anything connected to the inputs or outputs (older HP computers did this to me ).  You usually need to enter the BIOS and permanently enable the On-board Audio by changing the setting from 'Auto Detect' to 'Enabled'.
Hope that helps.

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