The RUEL R+ is designed to be as wide and smooth as possible on all frequencies.
On top of using small drivers, the R+ uses an aluminum diffraction slot.
This diffraction slot allows to get a wide 180 degrees dispersion in the high frequencies.
The system is designed to be placed against the back wall and because of this wide dispersion, the speakers don't need to be angled or toed in.
The shape of the cabinet itself is round to get minimal diffraction.