I'll be discerning the date of manufacture the next time I look to swap cables or something, to move these 107 pound Easter Island totems right now is just too much to ask of my back at the moment!
By far and away the midrange on these vs the 3.5's is significantly different, the treble is perhaps slightly less "etched" as well; mind you that neither opinion is anywhere close to being a negative. Voices in particular are almost startlingly lifelike - just listened to some Simon and Garfunkel as though hearing some things all anew. Methinks the slightly larger cabinetry - 7 inches taller, 4 inches deeper at the base, might have something to do with the midrange emphasis over the 3.5's. Obviously, the drivers and crossover difference does as well.
As did the 3.5's, the 3.6's absolutely excel with jazz. I like trio and quartets for the most part. I've been digging deep into Monk as well.
I'm thinking monoblocks already...
Kidding! Enjoy the weekend!