There's a lot of things that go into getting a quiet shot. How the string is made, silencer material, silencer placement, right amount of silencer (too much can add noise in some cases), bow design, bow tiller, bow tuning, nock fit, your release, arrow weight, arrow tuning....it's not just one or two things.

If you do your part, most any bow will be reasonably quiet. Get a few things off, and most any bow will be noisy--or at least noisier than it should be.