Hello,i'm new at this and dont know if its ok to ask questions about this here,so i have logitech z906 speakers http://www.logitech.com/en-us/product/speaker-system-z906 ,and my friend got me a soundcard for my brithday,the asus xonar u7 https://www.asus.com/Sound-Cards/Xonar_U7/,i dont know much about sound cards and i dont know how can connect my speakers to the sound card and then to my laptop and if i need new cables or what,if anyone can help me thanks a lot beacuse i dont know what to do anymore..