It is strange that you havent gotten any replies yet. I havent heard the Arro or the Prelude. The SongTower has one of the best 3D images that I have heard from conventional speakers. They have transmission line bass which works well close to the wall too. I tried the SongTowers close to the wall and they lost much of their great 3D image. I guess that would happen with the Arros too.
Bob
Bob