I would not call the Thiel CS2s "tinny" from my listening to them, they put out a good amount of bass until cutting off at 40 Hz; however, overall Thiels of that vintage were voiced a little more towards the highs than to give a warm sound (the opposite of the Vandersteens of that era). I almost bought them (this was back in 1986 or so) till I heard the Thiel 3.5s, which had more bass and a more open soundstage in comparison. Jafant's advice is good, as your room is potentially a tricky one. Ideally you want to sit back a bit from Thiel speakers for them to sound their most coherent, so having them on the short wall with room to bring them out into the room a little would be a good thing, but I'm not sure having them close to the sidewalls will let you hear them at their best (though sidewall room treatments, even plants, might help). Good luck--I think they are still fine speakers, a solid design.