Pal,
I had the orig version of the 6381's. I just put a pair of 6371's in service in my system. They are in the same room as the 6381's were. I have to admit that theses 71's integrate way better than the 81's for me on my equipment, and do not sacrifice much bass in comparison, but are not as boomy as the 81's. I would highly recommend the 71's unless you have a rather large room and even then the 71's may still be a better choice. Usher also added a 6391 with a 10" driver in the same position as the 8" of the 81's. I have not heard the 91's.
Good Listening! Ken
I had the orig version of the 6381's. I just put a pair of 6371's in service in my system. They are in the same room as the 6381's were. I have to admit that theses 71's integrate way better than the 81's for me on my equipment, and do not sacrifice much bass in comparison, but are not as boomy as the 81's. I would highly recommend the 71's unless you have a rather large room and even then the 71's may still be a better choice. Usher also added a 6391 with a 10" driver in the same position as the 8" of the 81's. I have not heard the 91's.
Good Listening! Ken