Robert Brown

All versions since 2000 use MGM’s heavily bass filtered remix

MGM 5.1 remix noticeably reduces elements of original mix

The 4K Blu-ray 5.0 is the original mix, but more muffled than LaserDisc and even the previous Blu-ray's gentle remix. The Atmos mix is revisionist.

The 50th Anniversary box set has some exclusive extras.

1991 LaserDisc is Dolby Stereo matrix encoded from the original six track master and this was later upgraded to a 5.1 Dolby Digital version prepared for the first DVD. The 5.1 version may have had some slight tweaking in the process. This was reused for the DVD CE boxset and then the 5.1 on Blu-ray seems like a slight upgrade of the DVD track. (The first pressing from the UCE boxset had audio defects rampant on the Blu-ray. These were corrected for standalone pressings.) All 5.1s sound roughly the same as the LaserDisc 2.0 in terms of the mix, but the LaserDisc PCM mastering seems like the only one that is direct without any major processing.

The 5.1 track on the earlier THX LD/DVD and SE DVDs is not the same as the later remix, and appears to be more faithful the original mix (likely a simple upmix). The UE DVD remix has a lot more surround activity.

StudioCanal 4K Blu-ray/Lionsgate Limited 4K Blu-ray (shared encode); slight improvement over the 2015 StudioCanal Blu-ray

StudioCanal/LG UHDs port the 1999 Criterion DVD, considered the best source

StudioCanal has a remastered Blu-ray, Lionsgate only a 4K Blu-ray