Question about Plasma tv?

I have this tv http://www.samsung.com/ca/consumer/tv-video/tv/plasma/PN42C450B1DXZC/index.idx?pagetype=prd_detail and would like to know what would be the best would to hook up my pc speakers to it I know it has a earphone out. but that only works for one speaker as I have three pc plugs. I have a converter but only works with AV plugs.