I've been wonder this very same thing and thought I would provide a link to the article regarding not using the subwoofer port. I'm not sure if I understand it, but here it is :
This setup will work but it would have to be in conjunction with a audio receiver. Tv's do not have enough power to drive these speakers so another audio device would work for that. If you do not want to add another piece of equipment then this would not be your answer. They will not connect directly to the tv. Through a receiver they sound great and would be loud enough to shake a nice size living room. Just ask my wife and kid.... I hope this helps..
Yes, you would need a home stereo receiver to work with this speaker system, you can not hook them directly to your tv. With the receiver, they should be louder, and much better sound quality, than what you get with your TV's built in speakers.
Hey Slater, I pretty much have the same setup you just described, got the Son STRDG 720 last week and just purchased these speakers today. Which speakers do you think would be a good purchase to convert this system into 7.1? I have two large polk bookshelves at home although they are a bit old, what do you think?