While 7Digital and Qobuz sell lossless files, you can convert those FLACs to 320kbps MP3 using software like LAME (the gold-standard encoder). This guarantees zero transcoding artifacts (i.e., no "double compression" from ripping a 128kbps file to 320kbps).
However, The Black Album was mastered by the legendary . He retained surprising headroom. Listen to "Song Cry" (produced by Just Blaze). The difference between the quiet, tense verses and the explosive, sample-crashing hook is massive. At 128kbps, that dynamic shift gets flattened into a garbled mess. At Jay-Z - The Black Album -320 , you hear the silence before the storm. You hear the room tone. You hear the breath Jay takes before the punchline. Jay-Z - The Black Album -320