I had a customer bring in an Infinity KPX00 crossover for a 6.5" car
unit. Coil L2 has burnt marks on it, Its a 24db linkquitz riley filter
(or so the spec sheet says).
Customer claims low tweeter output

http://manuals.harman.com/INF/CAR/Owner's%20Manual/KAPPA%20PERFECT%206-1%20om.pdf

in:
(+)
-------|
|
== C=15.7ufd
| C=14ufd R=(1,2,4) OUTPUT
|------------][------------/\/\/\/\/\------|
|
L2 (burnt) |
*
(tweeter)
| *
| |
------------------------------------------------
(-) (-)

So, the input is a series cap inductor combination with a 15.7 MFD and
unknown coil in series with the amp. The center tap of the two feeds a
14MFD cap and then goes through a series resistor adjustable pad
to the tweeter. I tried to read the coil on my sencore, and it measures
about .3 MH. It won't pass any ring test (air core) so i know turns are
shorted and this value is suspect. Any clue on the value of this coil?

Strange, this seems to be a 3rd order filter rather than what the tear
sheets says.
Only one coil on the high pass with two caps.
Minus the pad, it looks like the 3rd order 18 DB filter he

http://www.apicsllc.com/apics/Misc/filter2.html

and these calculated 3500hz values are (4 ohm nominal)
C=7.5 ufd
L=0.1364 mh
C2=22.7

standard replacement coil values are .1,.13,.15,.20,.27,.33 and etc.

Thoughts?

Bob


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