As I recall, there were speaker stacks on every crane up and down the dock. And they weren't in sync, which didn't help.
Plus the sound would also bounce back off the enormous buildings either side.
Quite why the radio broadcast ALSO sounded like that is a mystery though, you would have thought it would have taken the feed coming direct off the mixing desk, but it would seem they mixed in their own mics across the dock for crowd noise ambience, amplifying the echo.
One of the reasons Jarre would broadcast the show via the local radio station - so those at a distance could hear it in time with the visuals.
A great boon for the recorder equipped fan too.
I was stood in front of the stage, about half way between it and the grandstand whose apparently slipshod construction very nearly caused the show to be cancelled (there was safety inspection just before the show, I gather) - directly in line with the man himself, so the laser harp shone directly over my head. As a result, I saw little to nothing of the projections - never mind, thought I - I'd see them on the TV broadcast. Little did I know the TV cameras were shooting more or less over my head from the very same grandstand. Although the broadcast seemed to be mainly from the second night.
Still, I would love to see an unedited version of the TV broadcast - I still consider the butchery of Industrial Revolution and Revolutions on the official release to be crimes against humanity - the latter was one of the greatest live performances I've seen of Jarre's - with the song going on and on - and just when you thought it had ended - Jarre punched the air 'yelled' Revolution! - and went round again. Goose bump city.