Depending upon which headset you are using and the 'jack' size, you may need to invest in an 'extension' to fit the jack all of the way into the output. Some have plastic that prevent complete insertion. If you purchase the extension that is made for the iPhone, it will fit your MBA.
Thanks for the quick responses. The jack is seated all the way, but I have soundflower installed and will try removing that to see if the problem clears.
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audio jack output only mono?
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