The quietest recurve today is a Black Sheep. A well known shooter just tested one with a 12 strand 8125 string, put the brace height all over the place and could not get it to make noise.
Last weekend at the Iowa Trad shoot, I let my friend shoot it for a round and not only did he say it was THE most impressive bow he had ever shot, he couldn't believe how quiet it was, even with 330 gr arrows!
The first comment I always get is how quiet it is.
Limbsavers at the fadeouts (they were on the limbs when I got them), maple/glass limbs and nothing on the string.