I once cronied a dacron flemish and a dynaflight 97 flemish, with a 600 grain arrow, out of one of my own designs ( an r/d , flat, traped, longbow made of Brazilian walnut, Osage and bamboo i developed years ago) 60lbs at my draw. Dynaflight was an average 182 fps. The dacron averaged around 173 fps. So we are looking at a difference of about .5 lbxft/s of momentum. I personally prefer a heavier string because i do not have to silence them and they are easier on your limbs and tips. I defex all my personal bow to where they are pretty quiet, and with my heavy hunting arrows i have no need for string silencers. Now to suggest that my bows would be louder with a fast flight string would not be honest because i do not use them. And when we cronied the two strings i can not recall much of a noise difference. But with a faster limbed glass lam bow there might be a difference. Besides, i am one of those people who does not change what has always worked. Also, i have enough dacron 50 to make strings for the rest of my life.