Hi I have a fourth gen iPod Touch and a MacBook. Listening to any audio on the Touch is great with my Sennheiser HD280s but listening to audio on my MacBook is disappointing. There is a constant hissing/whirring noise that I can hear when my music is turned down. I don't experience this on my Touch, however. My Touch is dead silent. Anyway, I was wondering how the headphone minijack on the 11.6" Air compares?