[Adding 5th channel speaker to 4.1 Klipsch's?]

You need a SBlive 5.1 or a SBlive 4.1 and digital out with a DD decoder to have center channel effects. or some other 5.1 or 4.1 sound card w/ digital out.

[Klipsch Promedia 4.1 Upgrade question]

To remove your preamp from the sat, first remove the wires from the hole between the legs of the sat stand one by one. After that just tug at it some more. Don't worry about messing it up if you already have a new preamp.