I wasn't sure if I needed to post here or the Basics forum so I'll start here....I have finally decided to add a subwoofer to my setup and get the .1 I've been missing from the 5.1!!! I have never owned a subwoofer before and have a few basic questions: 1. Do I need the specialty "subwoofer cable" to connect? I'll be hooking up the sub (JBL PB10) directly to the reciever (Yammy RX-V620) through the "subwoofer out" connection. 2. What is crossover frequency and what should I set this to? 3. Should I change the settings (LG, SM)of my center channel and mains now that I am adding a sub? 4. I've heard alot about calibration devices here but I've never used one....does this purchase (along with a new Panny CP72 DVD player ) warrant a calibration?