DUNLAVY SC-VI

I think you want the speakers firing away from the short ceiling side so that reflections are not "focused" on the listener by the ceiling, but I don't have any empirical acoustical data to back that up.

Unlike the usual equilateral arrangement, a typical Dunlavy arrangement would be to start with the speakers about 11 feet apart and the distance from listening position to each speaker of 10 feet (68 degree angle between the speakers). You might be able to get the speakers 12-14 feet apart in that room. The soundstage should be fabulous.

In the manual for the SC-III, Dunlavy recommends sitting about a foot from the back wall and treating the back wall with 4" thick acoustic foam (four 4'x2'x4" panels would probably do it). Or at least that's the recommendation for a room about 20x13 in size, where a 10' listening distance would put you near the back wall. (I still have my SC-IIIs and wish I had a room this size to stick them in.) It would be interesting to see what the manual for the SC-VI recommends.