Measuring Le
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 Multi-Way Conventional loudspeakers with crossovers

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 28th October 2004, 09:24 AM #1 thatvan   diyAudio Member   Join Date: Oct 2004 Measuring Le Maybe I'm an idiot but I cant figure an easy way to do it. I have access to most test equipment so that is not an issue. Please dont link the soundhost page because that is where I was tring to figure it out from. Any help would be most welcome! Ian
 28th October 2004, 08:50 PM #2 GM   diyAudio Member     Join Date: Jun 2003 Location: Chamblee, Ga. Calc it, that's what measurement programs do AFAIK: Le(mH) = [(Zxo^2-DCR^2)^0.5/(2*pi*Fxo)]*1000 Where: Fxo = some frequency point well away from Fs Zxo = impedance at Fxo Dcr = Re GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
 28th October 2004, 09:05 PM #3 Timn8ter   diyAudio Member     Join Date: Jul 2003 Location: Seattle, WA Wouldn't an LC meter work?
 29th October 2004, 07:25 PM #4 Lsharptec1   diyAudio Member     Join Date: Oct 2004 Timinator, an LCR meter will measure the inductance of the coil, but you have to find a way to lock the cone to prevent it from moving when the LCR meter voltage is applied. Larry
 29th October 2004, 10:46 PM #5 GM   diyAudio Member     Join Date: Jun 2003 Location: Chamblee, Ga. Yes, you can use a meter to measure it if you have one. Why would you want to measure the driver when locked down? I mean what we want to know is its inductance at some frequency to allow us to accurately design a zoebel and/or XO ckt., so we want the driver moving at this frequency when we measure it. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
 29th October 2004, 11:03 PM #6 thatvan   diyAudio Member   Join Date: Oct 2004 I found this site. Testing setup and meathod fairly straight up. Is 1000Hz pretty std for Le measurments? http://www.webervst.com/spkrcalc/para.htm Thanks everyone! Ian
Timn8ter
diyAudio Member

Join Date: Jul 2003
Location: Seattle, WA
Quote:
 Originally posted by GM Yes, you can use a meter to measure it if you have one. Why would you want to measure the driver when locked down? I mean what we want to know is its inductance at some frequency to allow us to accurately design a zoebel and/or XO ckt., so we want the driver moving at this frequency when we measure it. GM
That's what I was wondering. These are "dynamic" drivers aren't they?

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