Looking for anyone who has knowledge of the original TDL studio 3. I have acquired a pair of what I believe to be early studio 3, all the pictures I have seen of them have a 2way binding post on the back. Mine have a single pair of banana sockets flushed into the back of the cabinets. These could possibly be an early version of the studio 3 and also looking at possibly upgrading crossover components, esp the tweeter caps as they will be old now. Any ideas or help appreciated.