If you really don't care about the sweet spot and actually sitting down to listen, the Bose 901's are hard to beat for filling a room with music.
what speakers to use
I have a very large family room kitchen combo that I am searching for speakers that will fill the area not just a sweetspot. The family area is 24' x 30' not including kitchen. Three walls ,one side open, 2 wall's 30',1 side wall 24'.The main seating faces a 30'wall.Speakers need to be placed close (12-18'') from back wall and 4'from one side wall.The distance between speakers should be at least 12' not more than 16'.I am using a 2 channel tube system with about 120 watts per channel.I am open to any type speaker cone,planar etc.