Surround sound question

hi, this is my first post of this forum, hope someone can help

I've just invested in a second hand projector (epson emp-tw10) in order to watch movies etc at home..I've connected it to my new MacBook using an RGB cable and mini dv connector..this works fine. But what I now want to do is buy some cheapish surround sound speakers in order to get a more cinema like experience.. I have my eye on some Alba as122 3.1s..available at Argos for £54. My question is, will these speakers plug into my MacBooks audio point?..and if so is it likely I'll have to purchase an audio cable to do this job?..I have a feeling the speakers I want will come with either a scart, or those red/White audio cables, neither of which connects to the macbook.. Am I going about this the right way?, or would I just connect the RGB from my mac to the projector, then audio cables from mac using small jack, to red/white connectors into the back of projector?... It's all a bit confusing.

Any help or suggestions would be most welcome.

I can't speak for this particular speakers, but you're feelings are most likely correct. You should look for some computer speakers with a powered subwoofer. The higher end models will have decent sound. Amazon often has come good buys online which include free shipping.

It's not simply a matter of buying an adaptor cable. You're MB will be pushing the signal which drives the speakers. The MB only pushes enough amperage to power a set of small ipod headphones. Computer speakers are designed to take the relatively weak signal from the MB and amplify it so that it is sufficient to power larger speakers.