Jolida 302BRC with 6 ohm speakers


Ok. I have another stupid newbie question. I bought a Jolida 302BRC and some Wharfedale Diamond 9.1 bookshelf speakers. However, the Jolida amp only has 0,4 and 8 ohm posts on the back of it. Which one would sound the best and would be safe to use with these speakers? I'm kinda clueless at the moment...Thanks!
bradmcc