A used pair of Legacy Whispers if you can find them will do exactly what you want. They are designed to specifically minimize interaction with the room and can be placed near corners. Open baffle compound dipole bass with included processor to adjust bass level as necessary. They image very well to boot. I owned a pair for about 3 years in a room nearly identical in size to yours and they worked great in that room (13 1/2 x 17 x 8).
Full Range Speaker That Can Play Near Boundaries
Application calls for a full range speaker in the 10K range that will work well in a 13 X 17 room but little ability to move the speakers out into the space due to furniture and WAF issues. (Speakers will be maximum 18" from front wall either positioned on long or short wall). Looking for a real music lover's speaker, not a hifi demonstration. Very real midrange--lively and tonally correct with taught bass (not bloated or slow), dynamic yet non-fatiguing sound. Soundstaging and imaging are secondary to accurate tonality and lack of coloration. Suggestions?