I've found myself thinking of Quadrille and Prelude in a pair, and loving them both mightily. Le Dix is not like her sisters.
Doing a compare/contrast, they're both based on a rich, dry, peru balsam-touched amber, which means it's more the cherry amber than the rootbeer (oppoponax) amber. There's a distinguishable vanilla here that hints at future gourmand vanilla ambers more than anything else of their time. It also reaches back -- I'm reminded of Patou's Normandie in that rich, resinous quality. IInitially, there's a moment of wondering if it may have turned as the amber has that dense bottom note-heavy amber feel you can get with turned frags. The amber will feel a touch dry for our time, but compared to the norms in it's day, it compares as really sweeter, more cherry-gourmand than others.
Where Quadrille and Prelude split is really interesting. Quadrille incorporates pimento, cinnamon, and has a higher musk component. It has the feel of a relative of Opium (Quadrille came first) with a hint of that rich spice line. However in Quadrille, it is very much a light dusting, not a rich heart. Quadrille opens with a very dry, mannered, rich amber, Then there's a moment of panic as you wonder if you just put on WAY too much. But wait for it, because in about 10 to 15 minutes, Quadrille suddenly dials it WAY down to mellow and becomes a rich, soft, subtley musky, kind of dirty, spicy amber.
In drydown Prelude picks up leather notes. Quadrille does not. It's very much a rich, dry skin scent, subtle and faceted. Also, Quadrille incorporates spice and "dirty" musk more than floral, while Prelude incorporates floral infused with spice.
Overall, you cannot test Quadrille in the vial, or in the first 5 minutes. And you probably shouldn't wear it publically your first time without skin testing it over time. You need to allow time for dry down and sink in, and you also need to see how loud it starts versus where it dials down to to make sure you don't overspray. This is an absolute treasure of beauty and I could scream that it's discontinued. There are still bottles around, but that won't last.
EDIT: To be fair, over time I've noticed that on my skin, Quadrille goes to a kind of next-day "dirty" skin musk, rather like Patou's Moment Supreme. It can be a little bitter, and overall, has not been working for me. If this doesn't happen to you, or dirty skin musk doesn't bother you, Quadrille is gorgeous. For me, I think of it in a pair with Prelude and I've found I'll always choose Prelude instead as it works better with my skin.