Does anyone know what type of crossovers (active or passive) are in the factory system? The frequency that a passive crossover operates at is dependent on the impedance of the driver it is connected to; in other words, if you put a 4 ohm speaker in a system that is designed for an 8 ohm speaker, the crossover point will change.

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Sold:
2004 X5 3.0 "The Xbox"
1990 M5 Eurospec "The Money Pit"
Current:
2004 Audi S4 Avant
2006 X5 9.0 "The Xbox2"