This is basically a sort of follow up to by “mono tracks butchered on 5.1 remixes” thread where I basically wanna go into instead about how audio restorations can go wrong. One minor example is Rosemary’s Baby, comparing between the US Criterion and UK Paramount pressings, which are of the same master. The Criterion pressing has noise and bass reduction on it, resulting in the mix sounding flat. But the UK Paramount pressing is free of both bass and hiss reduction so it sounds a lot more alive, vibrant, and more detailed. (comparison here: https://www.youtube.com/watch?v=QqOO3fty1Q0) But I feel that there are lots of other movies that Criterion and other companies have noise reduced which hindered the audio presentations, and I wanna know what others you’ve noticed as well.