If your KHL is sealed box, then you don't have to worry about back wall too much. It surely affects sound image (a little?), but I don't think you will notice the difference (at this level). I think you already know that ideal speaker placement is that tweeters are horizontal with your ears. So I don't think putting them on the bar will satisfy you. Maybe upsidedown placement solve problem for you.
Haha, i am still a newbie in speakers placement.
Edited by Meewoo - 7/20/13 at 7:44am