I had my STS on a few different bows. hoping it was just a certain bow that made a "slap" noise. It seemed to shorten and sharpen the noise from my Darton Tundra, but basically I had the same amount of noise. It did kill the vibration though. I also tried the STS on my McPherson Edge. On that bow, it definitely made the bow louder. I tried every combination I could think of, from setting the stopper as close to center as possible, to as far down the string as possible. From touching the string to 1/2" away. Never approached the "silence" that some guys rave about. Don't know why, but I've had more luck getting rid of bow vibration with a Sims Enhancer 2000 and an S-coil. Seems like it does the same or nearly the same vibration control, without the slap noise. JMHO