Thanks.How hard did you have to concentrate to tell the difference?I have a few songs in FLAC and various MP3 incarnations and anything above 128kbit/s MP3 is pretty hard to distinguish - the only exception is stuff which is very well mastered/high quality recording with real instruments (also the tracks which really show how the HD600 series shine).
And can you set certain playlists in Spotify for lossless and rest in 320k?