Why not horns?

Mapman: The bass extension of the k-horn depends on the length of the horn - which is the lenght of the corner in each direction. I believe that to get the full extension you need corners that extend 48 inches in each horizontal direction. False corners work just fine so long as there is a good connection to the speaker cabinet.

The speakers extend along the walls about 22' or so. However, due to the 'home plate' shape the part not touching the walls comes out aout 32 1/2". As I understand it, it is preferable to have a wall extend beyond the actual point of contact. With that said, I have one such wall, but the other is interrupted by a window a foot or two from the 22' extension. In the course of fiddling with my system, I have switched output sides a few times; haven't noticed any difference between the two sides. Just one comment re: the Lascalas. I liked the sound, but the stock Khorns have far superior bass.

i have windpw frames 21-22 inches from each corner. is this a problem if khorn is not perfectly flush against the wall
?

basically, the wall (for the k-horns) is part of the bass horn, so not having it flush ends the lenngth of the horn at the point where it is no longer effectively one piece. It is no differentin principle than the horn that loads the midrange, but the wavelengths of the respective frequencies produced are different hence the different lengths of the horns needed to load the respective low ends of the particular band - breaking the one solid piece that forms the bass horn is no different than if you sawed the midrange horn in half and set the two pieces next to each other - the horn loading the midrange driver would not consist of the two halves now but only the half that was continuous from the driver.

The Khorns need to fit snugly into the corners and against the walls on both sides. Their performance will suffer if this is not the case. False corners are used by many, however the height of the windows could be a factor aesthetically - not to mentiuon the WAF...