While I'm sure that higher quality (i.e, tolerance) components will make a difference in the sound, I was willing to bet that the xo setting made the more noticeable difference. Again, even changing the xo setting is a matter of taste, as long as the drivers are capable of the adjusted frequency.
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2 M80s, 1 VP180, 4 QS8s, 2 EP800s, 4 Algonquins, 2 M3 VaSSallos