DD had about 200 hits off the tee breaking it in, then took it too some indoor games. she and i noticed a difference in sound with her hitting. she is swinging the 2021 33inch drop9. she does like the the power carbon better but is very happy with the RXT so far.My DD crushed a line drive to the fence with her 2020 RXT, but claims she doesn't like the sound. Bat has about 100 hits on it. Do you know about when the sound changed? That would be great for us if it's going to change soon.