for my curiosity, why did you choose to design a B-version?
Both the 1801F and stand mounted 1801 are the "B" version with the same crossover. The explanation for the B version is here:
http://www.ellisaudio.com/1801bchanges.htmDo you think that bookshelfs are as good/better than column versions (with same drivers and equivalent volume)?
All of these comments are mentioned previously. My summary is... the quality of sound is the same.
Dave