(2018-11-09, 01:51 PM)Chewtobacca Wrote: If it's really the six-track from the 70mm, then we are definitely lucky that it was included at all. A lossless track would, of course, have been preferable, but (provided the mix remains unmolested) AC-3 at 640kbps should sound very good.
Sounds quite good. Thanks to fine folk here, I was able to sample the 5.1 mix. Also was able to sample some of the "new" Atmos mix. and now will be ordering the 4K disc this week.
As most here know, the first Superman had a number of audio mixes: 70mm 6 track w/babybooms and split surrounds, 70mm with babybooms and mono surrounds, 35mm 4-track, 35mm Dolby Stereo, and even mono. Then jump ahead to 2001 for the Thau / Donner 5.1 re-mix
This older but very informative interview covers these previous audio mix versions, albeit sometimes in a somewhat biased view being it is from Thau:
https://web.archive.org/web/200412061345...hau_1.html
I believe but cannot 100% confirm the letterboxed laserdisc mix utilized the 70mm mix, matrixed down to Dolby Surround for the PCM track. Not an uncommon thing to do in the letterboxed era of laserdiscs. The bluray theatrical cut of the move offered a optional 2.0 track, likely the 35mm Dolby Surround mix.
The 4K reissue offers two new variants to home video.
The Thau / Donner 5.1 remix has now been morphed into a Dolby Atmos track. From various reports, it sounds as if the Atmos overheads channels are used quite effectively. Another change was made to the Thau remix. The audio now remains correctly center based until the opening credits start, then swells into full atmos sound. I don't have full atmos playback yet, but will be listening what I presume will be discrete 7.1 downmix for me soon of that mix, once the 4K arrives.
The 640kb/s Dolby Digital track is the real hidden treat. All of the Thau revisions are absent. Krypton no longer sounds like chandelier planet and the beginning wooshes are subtle as they should be. And best of all, the minor but occasional subtle directional dialog has returned. It is often minor, but if your left/center/right speaker spread is wide you'll hear it easily. With this being a discrete mix, the directionality is easily better than the old laserdisc PCM mix. The front channel spread even with sound effects sometimes is wider than the Thau mix! Split surrounds are occasional but effective. From what I've heard so far, the 5.1 is what we would expect of a movie mix of that time period. This will mark the first time the 70mm split surround mix has ever appeared on home video in discrete form.
I believe there is a 2.0 Dolby Surround track on the 4K disc as well, and will be able to confirm once it arrives.