When you say above the couch are you saying flush ceiling mounted. A direct radiating speaker will work, but won't give you the same "surround" experience as the Q series speakers. For surround purposes, they are hard to beat. The point is you want to be enveloped in the sound, not have to be sitting in the sweet spot to enjoy a bookshelf design.
So it sounds like your wanting to mount the speakers on the back wall, above the couch? If so I would think the Q's spread out would do a much better job. They have woofers firing up/down and two tweeters firing left/right. If they were spread out they shoud work fine.
I would also consider the Qs8's over the 4's for the extra woofer size and power ability.
