Due to my room character, I like my Harbeths place against loong wall. I was listen to my C7 against the short wall initially. After I moved it against the long wall, I can not go back to previous placement. You shd try experience both placement and choose the one sound best to your ear. The SHL5 is easy to place (I have a pair too), it sound equally great when just 1 ft away from back wall without boom when place along the long wall and far away from side wall.
"Bath in Music"
Harbeth owner since 2004