questionshow do you interpret the specifications of a…

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With around a hundred bucks to spend, I would go with one of these: http://www.newegg.com/Product/Product.aspx?Item=N82E16836121036 or http://www.newegg.com/Product/Product.aspx?Item=N82E16836121048

If you would rather have home theater speakers (like your links), I would look at these and add a sub later. http://www.newegg.com/Product/Product.aspx?Item=N82E16882290200

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You can't trust the specs in many cases, so don't use just them to choose your speakers. Specs can be manipulated by the manufacturer by leaving out key testing criteria and making them look better than they really are. One of the biggest is Frequency Response. They often give you the full range, but not where the usable cut-offs are. In other words, they say their speaker goes all the way down to 20hz., but in reality, you may have stopped hearing good, usable sound at something higher, say 45hz or whatever. Get out and listen to some in your price range and check out some online forums, like this one: http://www.avsforum.com/avs-vb/