I recently purchased a pair of Nokia Purity Pros to go with my 1520. Over the month that I've had them I have to say that I'm a bit lost. To get the volume in the headphones to be anywhere near audible I have to have the Bluetooth volume maxed out. The problem that I'm having however, is that the audio seems to get distorted and crappy sounding. There tends to be a lot of hissing on s's and sometimes there is just general distortion. To clarify, as of today I am using WP 8.1 and I have the Bluetooth volume at 30 of 30 and the headset volume at about 60%. Am i doing this all wrong, or am I just doomed because of Bluetooth? Any help or suggestions are appreciated.