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Multi-Way Conventional loudspeakers with crossovers

Help - Forgot how to measure coils
Help - Forgot how to measure coils
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Old 11th January 2013, 12:23 PM   #31
mondogenerator is offline mondogenerator  England
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Join Date: Sep 2009
Location: City Of Villans
lol. I still think its simples to measure DCR and subtract that from a measured Z at a conveniant frequency, then subbing into reactance Eq to find L. checked works test set up and no cap in circuit. Im not sure why a more involved method is required to be totally honest.

Mod: could u pls remove my post no.28? Got befuddled by critics and ended up talking out my rear
Balancing the things I must do, with the things I'd like to do...This is a skill (or a luxury) amongst many that I do not possess.

Last edited by mondogenerator; 11th January 2013 at 12:30 PM.
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Old 14th January 2013, 09:03 AM   #32
ODougbo is offline ODougbo  United States
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Join Date: Aug 2011
Location: Maryland USA
mondo, just a little over my head

However, did go back and make up a new resistor pack with 6 - 8 ohm resistors.

Results were much better, and constant. The 6mH is the only one in question, looks like 6.5mH.

Extra credit if somebody can tell me why the coil starts singing at the measured frequency?

btw, I did order meter - VC6243.
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Old 14th January 2013, 12:13 PM   #33
speakerdoctor is offline speakerdoctor  United States
Join Date: Sep 2006
Location: New England
For you builders who might have woofer testers, you can use them to measure inductors (and caps) very accurately with proper calibration.
Below is an example using the original WT2 tester. That coil was taken from a Paradigm 3se MkI xover.
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