I just tried some Beyer 990s. I thought they sounded pretty good - certainly better than the ‘domestic’ headphones I’ve used before such as Bose Quiet Comforts. But I still got some ‘distortion’ (a sort of fizzing or crackling sound) in the background on certain notes; this happened when I was using a guitar with humbuckers (it was more noticeable on my guitar with an EMG Active humbucker)
This was disappointing - it’s the one thing I was hoping that some high end studio quality headphones would not do.
I’ve checked the blocks within the QC preset, there doesn’t appear to be any clipping, and the amp block I’m using isn’t particularly hi-gain.
I also notice I have to have the Quad C volume up pretty high with the 990s, is that because of the 250 ohm impedance?