Hiss in MacBook Pro Speakers

I have a MacBook Pro that has been giving an intermittent quick hiss (1 second or less) throughout the day. Obviously, the sound has to be on for the hiss to happen, but I have not found any pattern to the hissing.
I have sent the MacBook to AppleCare and they have replaced the speakers...twice, but the hiss is still happening after getting it back yesterday.
Does anyone have any ideas about what is causing it or other troubleshooting measures I can do?

I have this exact same problem and it's been driving me crazy for weeks! It's such a short tisk sound of static but is equal to the annoyance of dragging nails down a chalkboard. It will do it intermittently but never ceases to stop.. that is until I read your comment about Outlook. Then I remembered that it hasn't always been making this noise and I only recently installed Outlook. I closed Outlook and didn't hear the sound. I opened Outlook and within seconds after hearing the initial welcome sound, the "tisking" was back. Though I only tested it for 30 seconds before returning to iTunes.. I'm pretty sure Outlook is the problem. It sounds as if it makes the sound every time it checks the server for new mail.. or something of that nature. I can't say it's doing it on all macs because I have a late 2009 MacBook Pro at work and have Outlook open all day. Never heard the sound on it.
Still, a bit of relief that it's not my sound card or something serious. Hope Apple or Microsoft comes out with a fix.. I'm going to assume this is Microsoft's fault, though.

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