I totally agree with SteveB. They can be as quiet as any other recurve. I like to add yarn wraps to the string where it contacts the limb, or add Velcro to the limb itself. I have found that two pair of small whiskers installed 9-10" and 14-15" from the string ends, along with the padding, makes them very quiet.
The older, skinnier limbs seemed a bit louder to me.
One other thing that some guys overlook, is the rubber O rings on the limb alignment pins. They need to be replaced every year or so. When they flatten out completely, it will cause a bit more noise.