Click/Tick/Hiss sound before audio comes on when using headphone jack.

This started happening yesterday on my 1.5 week old macbook. Whenever an audio source comes through after a period of silence, say on IM without any music from iTunes playing or when you just start playing a song in iTunes, there is a short but very distinct ticking sound that happens before the audio is played. At first I ignored it but after a while, it got really annoying; especially when you're typing in an IM conversation and the tick happens on every send and reply. Is anyone else having this problem? Should I call up applecare/visit my local apple retail store?
It happens on both battery and AC. I've already tried resetting the PMU. I don't think it happens when using the macbook speakers, but I can't say for certain since the freqeuency response on them are pretty bad. And this also happens when I boot into Windows using bootcamp.
P.S. If it turns out that this is a defect, since this is a custom build to order machine, should I call applecare to get it taken care of or would I be fine if I went to the apple store that's 20 mins away?

I just tested using my headphones. I can hear a very short, soft, single tick sound when I click to start playing a track in iTunes. I've never noticed it before. But I don't do IM a lot.
Unless you're hearing something more dramatic, I think you would have a hard time convincing someone in an Apple Store that it's a defect worth fixing.
What about visiting an Apple Store, take your headphones, and try them on floor samples to see if they all do it? If not, you could make a case.

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