Left headphone volume low and warm.

Ever since I upgrade to Mavericks my work 27' iMac's has had a sgtrange issue. I use earbuds a lot while I work. This has never happened before before the update and not on my personal Macbook Pro.
Issue:
The left side of my earbuds is not working properly. Its very low and crackles if any sound comes out at all. It is also warm/hot. The right side does not have these issues. First I thought it was my ears, which are Apple. At lunch I walked with my iPod and was amazed they worked fine. I put the earbuds in the iMac and same problem. I tried other apple earbuds same problem. This only happened after the updates. I have installed all the other updates and no fix.

Most likely, it's an issue with your output; you've done a good job eliminating the options. Logically, it's either the input or a hardware issue that can be solved with a future update.
Or, it could be something else. Try using a different set of headphones/earbuds on your iMac, just to make sure they function equally; if the sound is similar (low, crackly), it's likely the headphones. I'm betting, or hoping, it's this.
Or, move around mini ear jack a little. Do you hear any crackling as you move it or turn it around? It's possible one of the pins got bent slightly. It's happened to me, and repair is your best option.
Or, it could even be a logic board issue. This doesn't happen much with iMacs, but it has been known to happen. Your 27" iMac isn't light, but getting the Apple crew to look at it might not be a bad idea.
Take it slow, and let's see what happens. Post with your results!

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