hello everyone. i have a problem about pc audio . i am looking for some powerfull system 5.1 for my pc and i dont know what to get. i currently have on my mind the edifier s550 or something like lg-bh 7440p which i can connect it throw optical . if anyone knows and can help i would appreciate.my price is max 500 dollars. i will be using it mostly for gaming and movies rarely for music but i would like a crystal sound with a powerfull subwoofer . thanks