Hey, rather than spread out these questions over several threads I'll just dump them all in one, and hopefully some knowledgeable people will kindly help my queries (which are probably idiotic). Can music play through all speakers on a 5.1 speaker setup (I'm not talking about SACD, etc, I mean connect to a computer playing CD's and MP3's). Because I thought music was 2.1, so does that mean 5.1 speakers (say for this discussion the Logitech z-5500) will only play music through 2.1, but if you watch films too, you'll them get surround sound? If you can get audio to play 5.1, how do you do it? And does it sound better than 2.1? What if the speakers I'm looking to connect to my computer don't have an inbuilt amp, Can I still use them? Would I need to hook up an amp, and how would I do this? Can I use any amp? i.e. a hifi amp, or do you need special connections to connect to a computer? I have a Macbook Pro BTW if that makes a difference. Why/When would I need to buy a soundcard? What does a soundcard do exactly? I gather the computer has one built in, so what does buying an extra one that connect via USB, Firewire or the express card slot do, the standard on doesn't? Can speakers without ampification be run through headphone amps like the ones here, http://www.headphone.com/products/headphone-amps/the-micro-line/ or here http://www.headphone.com/products/headphone-amps/the-desktop-line/ ? Do 5.1 speakers (once again, the Logitech z-5500 for example), automatically play DVD's as 5.1 surround sound, when connected straight into the computer? Or do I need to have a better sound card, or some other extra? Finally do 7.1 speakers work just like 5.1 speakers, or do they require extra setup? Sorry for so many questions, and sorry if so many are ridiculous, I'm just pretty lost of these things, and thought I'd just put it all in one thread. Thanks to anyone who can help me.