jackbp

Hi All Just got the Promedia 2.1 set, and I'm going to be using them with my Macbook Pro. Will they be fine just going into the audio out of the laptop? Or is their an additional part I should buy to optimize sound quality? Also, it seems as if most of the sound is coming from the speaker with the volume knobs. Its not really noticeable when sitting right in front of the system, but when I move to the back of the room all the sound is coming from one side. Is there a way to fix this? Many thanks