I am putting up a home theater and got very confused with the audio connections. I would appreciate if someone could clarify the puzzles below that I have, 1. Audio connectors, coaxial connectors, and RCA connectors are the same. By that I meant they are connectable to each other directly. Is it true? 2. The connector-types above can be used to transmit digital or analog audio signals. In other word, it could be either one, and one can not tell whether the signals for output or input are in digital or analog format. Is it true? If both are true, I have a third question, What will happen if one blindly makes a connection, say outputting digital signals from a device into another device that accepts analog signals, or vice versa? My DVD player has a digital Dolby decoder. I also have a Pro-Logic capable receiver which I bought years ago. I hope to use the two for a 5.1 system. The DVD player has an optical connector and 2x RCA-type connectors (L and R) for output. The receiver has 2x RCA-type connectors (L and R) for input and 5x connectors for output to speakers. Will it work if I just make the connections? I know the subwoofer will be wasted. Thanks.