It can depend on the audio format and bitrates that are used when producing the DVD.
I only have this version
http://dvd.gnr.gr/dvd's/1992/06.06.1992%20Hippodrome%20de%20Vincennes%20-%20Paris,%20France,(Unknown).htmIt has mpeg2 audio with a bitrate of 224 kbps, and sounds pretty good in my opinion.
Of course uncompressed LPCM is always the best, but takes up a lot more room.
I personaly prefer mpeg2 audio for music DVD's as dolby digital just kills the dynamics of live music in my opinion, and you can hear the compression.
I don't understand why some authors use dolby digital yet only fill up about half to three quarters of a disc when on most of them they could use LPCM or Mpeg2 at worst and get much better audio results. end of rant!
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What audio is on the version you have?