We’ll be doing a grind this week, I’ll send you a video. It doesn’t seem particularly loud, but it’s not quiet. You don’t need hearing protection, but you won’t accidentally leave it on, either. I haven’t tried really hard-frozen stuff, usually partially thawed but still a little crunchy. I’ll test it this week. (I think almost all grinders I looked at recommend not grinding bones, but all the reviews show that most of the bigger ones grind raw chicken bones with no problem.)