Hi Geoff:
Robert Ludwig was the original mastering engineer for this album and arranged to cut deep grooves for better dynamics. The story (myth?) is that Ahmet Ertegun's daughter's record player could not track it so Ertegun ordered it remastered (not by Ludwig) and repressed which reduced dynamics.
The early versions have RL written in the deadwax.
Robert Ludwig was the original mastering engineer for this album and arranged to cut deep grooves for better dynamics. The story (myth?) is that Ahmet Ertegun's daughter's record player could not track it so Ertegun ordered it remastered (not by Ludwig) and repressed which reduced dynamics.
The early versions have RL written in the deadwax.