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#11
That's probably a good instinct.
Subwoofers on PCs are often sold to game-players that just want to rattle walls without any intention of accurately reproducing music--just as subwoofers are sold to these jokers you refer to for car systems.
There are some pretty high quality amplified speakers for PCs, but not in your price range.
And they tend to be larger.
You just can't expect much from small speakers with a diameter of only a couple of inches.
So lower your expectations. They can actually sound pretty good if you don't have anything else to compare them to.