Sound wise, my DVD of SUSPIRIA will murder each and every release of this film. Period. Hands down. We'll take the Pepsi challenge any damn day of the week. :)
My partner on that one would remember how we captured the audio. It is from the laserdisc but I do not recall how we recorded it.
The DVD's do not have very good sound. The laserdisc's PCM stereo played back via Pro Logic II can't be beat.
That being said, the 5.1 mix on (I think) the British release is close. It is not the Anchor Bay remix. But unfortunately it has a terribly screwed up transfer. The French BD is better.
I've emailed my restoration partner and asked him the status on his BD restoration. He is working on one and I guarantee you, no one will do a better job. No one on this planet.