After distillation, the eau-de-vie is put into a new oak barrel at its natural alcoholic degree and left for roughly one year. After that first contact with the young oak, it is then transferred to 10-15 year old oak barrels, where it will spend the rest of its aging period. With regards to reducing the alcohol level, they will only start reducing two years before they plan to bottle that coupe (blend basically). Reductions are done in small increments, never exceeding 5% at a time. And the reductions take place slowly over that period of two years leading up to bottling. Each reduction is followed by a period of rest to let the Cognac settle and harmonize. Obviously, depending on which Cognac is to be bottled and its respective age, the amount of water for the reduction will vary.
For example, we tasted a 2011 that only just started to be reduced as it will be incorporated into the Napoleon Cognac in two year’s time. It might require three or four 5% reductions to reach 40%. The XO, on the other hand, is a 30 year old Cognac, so by the time they start doing the reduction, it may only need one or two small reductions before reaching 43% (desired bottling strength for that Cognac).
This was an interesting approach and shows a nice contrast from producers who immediately reduce down to 60% or 55% right after distillation. Lastly, it goes without saying that for the big houses that purchase Compte 2 Cognac, they buy it at its natural alcohol level.