Jonno said:

Does anyone know what the story is on Close Encounters of the Third Kind? The DTS tracks on DVD and Blu-ray get univerally good reviews, but having never seen/heard the film theatrically I just wondered if the original 6-track mix had been significantly tampered with in its transition to home theatre (a la Jaws).

Jaws was mono. CE3K was 6-track. I can't say whether the modern mixes are faithful to the original 6-track or not, since I've never seen the film in a theater, but the bass humming when the UFOs fly by seems robust, so I'm guessing that the "baby boom" effects are intact (unlike a certain other film from 1977).

Late 70s/early 80s 6-track releases often seem to have faithful 5.1 "remixes." We all know about Alien, but I can't recall complaints about CE3K, or Raiders of the Lost Ark, or Blade Runner.

Now Superman...I have no idea what happened to the 1978 6-track mix for that. The theatrical cut releases only have a 2.0 track that sounds to have the standard 35mm Dolby Stereo dynamic range. (However, some people on Home Theater Forum have complained of phasing/bleeding issues that aren't present on the old laserdiscs. Supposedly, the laserdisc may more accurately reflect the original Dolby Stereo? I can't comment on that.)