My PL (see my signature) can be super quiet, or a little loud, depending on my release. It usually is silent, and when I can hear it, I know I'm shooting it 'rough'.
I shoot a pretty heavy arrow, too (about 700 grains), and at the distances that we shoot trad bows, usually have no trouble hitting what I'm aiming at.
I was getting a bit of a clink off the shelf, due to my shooting style, and changing the nock height didn't help at all. I ended up fashioning an arrow rest for it, and now have much better arrow flight, and a very silent-shooting bow.
I shoot split-finger, by the way.