I'm interested in maybe getting 5.1 speakers for my G5, like the Klipsch ProMedia GMX D-5.1 Speakers or Logitech Z680 5.1 Speakers on The Apple Store. I'm thinking they're way overkill for what I will use them for. Mainly (or at least right off the bat) just for iTunes listening - maybe occasional DVD, and in the future games. So, when listening to music will it play through all 5 speakers or just the front two? Thank you.