The DualDisc does not state how they acheived the ambient surround , fwiw.
But I would recommend it as it does present much more on the dvd than the SACD. This is one of perhaps a couple of titles I own of a fifties (59 ) recording enhanced with surround that has discernable ambience in the rear channels.
View attachment 30861
? The rear channels are louder on the DVD than the SACD?