I have mostly DSD files loaded on my Calyx M and 40% are male vocals. Have compared between Oriolus, SE846, Z5, etc. Don't find it anyway thin or recess, and in fact, I like it more than the other IEMs for vocals. Any particular songs you tried to conclude your listening and which IEM are you comparing to deduct that? You are using the WM1A to test? Probably will avoid it in this case. Found shops selling WM1A in Tokyo selling better price and was considering grabbing one.