Let my start by giving you an overview of my listening position in my new house. I have a PC in front of me (at one foot distance) and the front speakers on either side of the monitor. There is no space to place a center here. However, I do need it as dialogues are not clear for movies encoded in multi channel audio. My question is can I place the center speaker behind the single seater couch? I have a shelf there on which I can keep the center at ear level. The shelf is about 3 feet from the couch. Will that position affect the intelligibility of dialogues?