Thanks for reply. When you say "BTW, without these enhancements, the Alison speakers are probably a better bet for most people IMO. They will at least play the top octave of the audible spectrum. That's very important if you can hear it", I'm sure I can't hear it. But my idea was that the Allison drivers supposedly radiate the sound in a half hemisphere so that if you walked halfway around the speaker, you would hear what you were talking about - that is the sound would be the same on either side as the sound from the front. You couldn't walk behind the Allisons and hear the same sound, but because they are designed to be backed up against the wall or in a corner, the front and side sound should be reflected from the walls ala the Bose 901. So I would assume the Allison and Bose sound would be similar - but I don't know - I have heard the Allisons, but not the Bose 901s.