@MatrixAudio Just tried some upsampling to PCM7xx rates using HQplayer it seems that there is some kind of bug with the Matrix sabre PRO (non MQA version) i notice pops/distortion pops? when digital volume is set to -3dbfs, curiously it doesn't happen on all tracks, and it happens at the exact same point in music file each time, also it doesn't seem to happen at 0, or -1dbfs, it starts happening again at -2db but much more infrequently, while -4db is completely fine, does anyone have a idea what's going on???
For anyone curious here's a song where it happens when it's upsampled to 7xx rates using HQplayer
https://www3.zippyshare.com/v/Gpi7I6fP/file.html