I'm new to the Polk family I guess you could say, I just bought a pair of Monitor 7's about 2 hours ago and I'm very impressed by their sound. Very clear, very clean sound, it's great. However, since I'm a newbie when it comes to home audio and Polk speakers I was hoping to get some help identifying what model these 7's are. (A,B, or C). If anyone can help I would greatly appreciate it!