Neil S. Bulk said:

... The 5.1 track on the Raiders DVD was derived from the original 6 track mix. Nothing was added or taken away. The mix was done at Paramount and not Lucasfilm. Had Lucasfilm been involved, I'm sure new elements would have creeped in, but as it is, the DVD IS the original mix. And the original Dolby Stereo track was derived as well from the 6 track master. This isn't a case like Star Wars where multiple mixes were made.

The digital PCM track on the widescreen laser disc is wrong! It has at least one sound effect that is different from the original film and the analog sound on the original LD is pretty fuzzy sounding. Neither are worth preserving.

Neil

Neil can be considered an authority on such matters.