There are also other reasons for wanting the midhorns in the corners on top of the bass bins. One is that the corner helps smooth midhorn response. It is physically large, but it is acoustically small at the lowest frequencies. Corner loading helps make it act like a larger horn and smooths its response. Also, the π cornerhorn design uses sound sources that radiate 90°, matching the expansion of the room corner. Each sound source is toed in 45° with a pattern that covers 45° on either side. This creates a uniform reverberent field. When moving the midhorn and tweeter away from the corner, you lose these benefits.