hairy_hen said:
Interesting . . .
Sort of makes me wonder if the 1993 mix of ESB could actually be an exact reflection of a possible 'revised' 70mm version. It is said to have been taken from a 4-track master with non-limited dynamic range, and since it matches up with the 35mm edit of the film it seems possible that this is where that might have come from. This 4-track master cannot be an earlier version of the 35mm mix itself, because there are a few minor differences from that, most noticeably the missing snowspeeder crash sound, and also a few changes in blaster and explosion levels during the battle.
You read my mind, that was exactly my thoughts as well, for those interested in the making of those Definitive Collection LD audio tracks, this is a must read: http://originaltrilogy.com/forum/topic.cfm/DC-amp-Faces-Original-audio-sources/post/220622/#TopicPost220622