I learned to echolocate as a kid, and to me our living room couches sounded like black holes. We had wood floors, and I think the way they reflected sound made

I learned to echolocate as a kid, and to me our living room couches sounded like black holes. We had wood floors, and I think the way they reflected sound made the absence more obvious. I can still do it, but like you say, high end frequency loss is a major factor. My accuracy is nothing like it was.