I use a passive but it's the in ear Halo's from Quiet Technologies which according to the guy that makes them are as good as ANR, and I love them. I just want to get a good ANR, but she doesn't want to spend that much. Most of the good ANRs even used on Ebay are several hundred dollars. But she's telling me a cheap passive is OK since at this point she isn't flying with me all that much, but I just don't thing she's going to like them. Several years ago before I got out of flying and sold them, we used the LIghtspeed 25XL and 20 which I really liked. She's only ever worn ANR (the 20) so I really don't think she's going to like a head clamp.