Does anyone know if there are any alternatives to the stock headphones that will work with the built-in noise cancelling on the Xperia Z2? They're not terrible headphones but coming from shure z215s they're a definite backward step. But the noise cancelling with no power source and no clunky...

Hi, I've got a new 24" iMac and I want to make the most of my music library on it. I've got a NAD 3020 amplifier driving Wharfedale Diamond 9.1s, and I need to connect my iMac. I've got about a 5m span between my iMac and the amplifier. I need to know whether using USB or the iMac's optical...