I am using a Niles 8630 (30W x 6ch) amp to push backgrd audio through various rooms ranging in size from 2000 to 4500 cubic ft. I want ceiling spkrs but am concerned that the ceiling height (12 to 14 ft) will create considerable loss of bass. I want a full sound. Does anyone know of a good spk for this application that is easy to drive? Would placing the spkrs close to the corners create better bass? I am more concerned about the sound than costs at the moment.