I recently heard the Sopra 2 at a New York dealer. He had them 3 feet from the back wall and away from the side walls. Were driven by McIntosh equipment. I loved the soundstage, but the bass was boomy. I've read the Focal includes a bass plug to tailor the bass response. Does anyone use it? I really want to like the Sopra but if i can't get reasonably flat bass response I will look at other speakers. thanks