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      12-15-2010, 04:53 PM   #14
montr
Second Lieutenant
 
Drives: 2010 335d
Join Date: Sep 2009
Location: Atlanta, GA

Posts: 268
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Quote:
Originally Posted by Technic View Post
The crossover circuit is an LR design, with 3 levels of tweeter attenuation (depending on the sound system installed -Business, Professional HU, iDrive):
I think my passive crossover is different than your crossover. I have the 268 kit, not the 684. The crossover has 2 wires on the inductor side and 4 wires on the other side. I can see the inductor on one side. On the other side I can see a resistor and a capacitor. Measurements with a DVM confirm that there is a capacitor in the path.

I think the crossover is a first order lowpass for the midbass (1 inductor). For the highpass to the tweeter, it is a first order (1 capacitor) with some attenuation (1 resistor).
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