No wonder you're confused. Firstly, ask yourself... how will a small powered subwoofer that is made of plastic shallow enclosure, very small driver, hollow sounding and does not go low going to improve your sound system. Secondly, ask yourself is your front stage (player + amp + front speakers) sounding really good now?

If you're not sure about the first question, try answering the second one. If the front stage is not right in the first place, try working on that first. Once the front sounds good (not thin sounding, not hollow, not overly digital and processed sounding.... blah blah) then you can work on adding a subwoofer to add better low end and to give you a better ambience.

HAve fun!

pengsan man...

The 2008 Pioneer players offered by yohannes in the buy/sell ICE section are pretty cool and they have my thumbs up for the price bracket.