I'm going to have my Parker Tornado with the string suppressors retested and after I do I will give a update. Both with and without the string suppresorrs. When I pick-up my bow it was already set-up with then on. They had a chrono there in the shop. I shot three bolts inside their shop. When I ask them why is my bow shooting so slow, they said it was because of the string suppressors. The guy that work there said how much quieter they made the bow, compared to without them(he seem very impressed with them). I'm Shooting the Redhot bolts with 100gr fp(Just like on the Parker video but they don't have the string suppresoors on the bow). I'm new to crossbows, so I belived him. I thought I had to give up some speed to quiet the bow down. This is a new bow shop, my old bow shop closed. From what I'm hearing, I will look for a diffrent shop! NOT VERY HAPPY!!!!