Eric, although that particular sub isn't one that would be on my shopping list in that price range, I doubt that it should be described as "crap". It's hard to evaluate someone else's subjective description of sounds, but the "muddy" term that you use may be what any sub playing only the fundamental frequencies with little or no harmonics produces. When you set a sub to roll off above 80Hz or lower and then disconnect the mains, you hear dull thuds, which can't be termed "fast", "tight", "musical", etc. Nevertheless, when combined with the harmonics which the mains play, the net result is full-frequency music.
