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.

LFR1100 Actives,QS10HPx2,QS8x2,EP800,M3x4,M3x2 (Wood),M5HPx2 (Wood),AxiomAir,ADA1500-8,ADA1500-7