I think a big part of recurve limbs and quietness has to do with the limb design and balancing. There are a lot of great recurve designs out there. The ones that have good enough string tension at brace to stop the limbs clean without string slap are going to be much quieter.
The static tip RC's and Semi-static tip RC's seem to be the best on noise because the string starts wrapping back on the limb tip earlier in the power stroke.
I was amazed at how quiet these two bows were with no silencers on the string at all.
Here is Eagle wings "Storm Eagle"
This is the new "Sasquatch SS"