I know this is a stupid question but I would like to know that if I plug my powered edifier r2000db speakers into the speaker port of an asus soundcard and my separate completely different powered subwoofer into the center sub port, will the soundcard automatically create a crossover and play sound the ought both the ports? The reason I'm asking is because I would like to buy a powered sub soon so those bass frequencies will really shine, so if you have any recommendations for a below $250 powered sub then that would be appreciated as well.