Quad 988 in 15' x 12' room

how well will a pair of Quad 988s function in my 15' wide by 12' deep listening room? the speakers would be about 3' from the rear wall, about 3' from the side walls, and about 6' from my listening position. these speakers would be about 7' apart, and set up along the 15' wall. they would be powered by the McIntosh 402 power amp, McIntosh C2200 pre amp and a Musical Fidelity Tri Vista SACD player would be the source. FYI - i don't normally listen at very loud levels.

any assistance in this matter would be very much appreciated!