About two years ago, I bought two pair of Bose 901 II ($600). This was (to me) a good deal. Acoustically the speakers had no issues. The auction included a working EQ unit. The only oddity is that I got three L and one R speaker. So today, finally tired of listening to one "upside down" speaker (for symmetry) I took a hammer to the oddball and have determined that you can't (easily) remove the bottom or top of these speakers. I am now the proud owner of a pile of wood chips and 9 spare drivers 
I will post a photo if the audience demands.
I will post a photo if the audience demands.