Have had the HD600 for a little more than a week and I'm quite impressed by the upgrade from HD515 (old HD518). Yesterday I switched back to note any difference... wow, they suddenly felt very muddy and low on detail compated to the HD600
I've got one question though. When I'm running from an Xonar STX, it feels like the sound is a bit strident. It kind of gives me headache on brighter music after an hour or so. Will the o2 or schiit combo make it sound less strident?
I have a JDS Labs O2 and it did not pair well with my HD600. The HD600 sounds great with all my other amps and the O2 sounds fine with my other hp's but paired together didn't work for me.