Question Asus Essence STX II delivering more audio to one channel (headphones)

Indiana

Distinguished
Apr 19, 2010
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Not sure why, the left channel of the headphone is having more volume than the right channel, I checked with the mixer that they were both at 70% (reset).

I ruled out the headphone being at fault here (Sennheiser HD600) by using another computer, they both sounded exactly the same.

Any ideas what could it be?.