I was working with old itunes version and decide to verify what soundcheck does to my file with soundcheck, so I asked A.I. :
answer was:
Sound Check in iTunes applies loudness normalization at a target level of -16 LUFS, which is slightly lower than other platforms like Spotify and YouTube that normalize around -14 LUFS. Unlike some other tools, Sound Check operates track-by-track and uses metadata for playback adjustments rather than altering the audio file itself.
So it’s true, Streaming services are not equal and not necessarily thru the original!
Did you know that? what about tidal, Deezer, QoBuz???
