I am not familiar with Thiel, but I do own a set of BW N804's. I know they need the right electronics. I have a Classe 300 Watt amp that does it justice. However, I have heard them sound better with better electronics. But if I had my choice (and cash), I would spend the extra "g" and get the N803's. For the price they give a good return on the investment. more depth and just a more "musical" speaker. But again, the right componenets make all the difference.
JB
JB