OK, sounds like some options may still be open here so I'll jump in one more time.
Since you are/will be building the room, why square? If you are locked in to a foundation already constructed, look for ways to open the new room into an existing space to change the standing waves. Otherwise, if not too late, redesign the room.
Speaker choice -- I owned Duntech Princess speakers for 19 years and remain a big fan of John Dunlavy's designs. However, I never would have traded my Princess even up for a pair of Duntech Sovereigns for my 20' x 17' x 11' room. It is simply not large enough. I heard the DAL SC-VI only once, at the CES. But I also heard the Sovereigns in a multiple of rooms of various sizes. I would consider a room about 28' x 19' x 11' to be the minimum, AND I think the SC-VI may need something even larger to perform near their capability. With a room anywhere close to your stated 20 x 20 size I would look for Duntech Princess or DAL SC IV or IVA.
Good luck.
Since you are/will be building the room, why square? If you are locked in to a foundation already constructed, look for ways to open the new room into an existing space to change the standing waves. Otherwise, if not too late, redesign the room.
Speaker choice -- I owned Duntech Princess speakers for 19 years and remain a big fan of John Dunlavy's designs. However, I never would have traded my Princess even up for a pair of Duntech Sovereigns for my 20' x 17' x 11' room. It is simply not large enough. I heard the DAL SC-VI only once, at the CES. But I also heard the Sovereigns in a multiple of rooms of various sizes. I would consider a room about 28' x 19' x 11' to be the minimum, AND I think the SC-VI may need something even larger to perform near their capability. With a room anywhere close to your stated 20 x 20 size I would look for Duntech Princess or DAL SC IV or IVA.
Good luck.