Thanks for the information guys,
I thought after I made the post that perhaps I should have given a little more info on the room. I have all the room I need to adjust the listening position forward or backward. The room is actually 28 feet square with 10 foot side walls and an 18 foot vaulted ceiling. A centre speaker presents a problem however since there is a woodstove smack in the middle of the wall I want to place the speakers on. The soundstage properties are very important to me, I am after excellent instrument localization with "space" around the instruments over the width and depth of the stage. With the centre speaker not really an option, my concern is that the Khorns won't be quite able to fill the 28' space. I will be driving the Khorns with a modified KR BSI 18 using 845's and analog source.
Gene