1. I have an option to by this at less than 200$. Now, I want to use it in addition to a simple mini stereo machine for the purpose of music, not movies. I don't have a receiver, so I want to connect the sub woofer directly to the sound card of the computer - the sub out. what is your opinion about it ? how will it sound ?

2. The sound card will play regular MP3 files will have sound for the sub out, it doesn't have to play AC3 or a file with multi channel on him ?

thanks