Dipoles disperse the sound, making it seem as if the sound doesn't have a particular point of origin on the side of your room. Some find this preferrable for movies, but others like a identifiable point of origin when listening to music, so only you can make the decision for yourself.
I use dipoles on the sides and monopoles on the back wall. I have tried every configuration and use the dipoles since distance to my sides is a lttle closer than to my fronts or surrounds(2-3 ft. closer) This helps surround me in the side effects and helps when using EX or ES titles with seemless sweeps during flyby type scenes.
I own B&W Nautilus so my only options are between the Nautilus SCM1's or new 700 series DS7. DS7 are both mono and dipole but I am concerned about how they would blend in with my Nautilus. The fact that they (DS7's)can do both, dipole and mono, make them very appealing. I don't have a B&W dealer close enough to borrow a pair from to audition.
Di-poles came to be in the ProLogic days when the processor created the surround illusion. The diffuse sound helped that illusion. Today movies are recorded in 5.1 so it makes it a matter of personal choice. Go listen to both and see which you prefer.
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