That is a loaded question that everyone will think differently about. My 08 x2 sub sounds fine. It gives the sound and a little feeling of bass, but not like the systems I put in my truck growning up (2 10s with alot of power). It is perfect for me as I don't need anymore. If anything, I will put tower speakers on and I dont have enough power for more bass and tower speakers without modifing the power system which I will not do.
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