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Old 20th March 2017, 07:02 PM   #1
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Default Coil for woofer DIY 3 way

Hello, for my next diy 3 way build with the well known Saba Greencones I need an advice concerning the coil for the woofer section...
The constructor says 4,0mH coil... but I only have a 4,7mH...
Shall I hear first and then maybe search for a 4,0mH?
Or can I somehow unwind the coil a little?
Is there a way to measure this?
Greetings!
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Old 21st March 2017, 02:51 AM   #2
Ron E is offline Ron E  United States
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Unwinding inductors
Inductance varies by the number of turns squared.
L2/L1 = (N2/N1)^2
Count the original # of turns (N1) and use initial inductance (L1) and Desired inductance, (L2)
Solve for N2:
N2=N1*sqrt(L2/L1)
N1-N2 = number of turns to remove.
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Old 21st March 2017, 03:20 PM   #3
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Hi, please explain the hyroglifanes : ^ and *...
What is sqrt...? :-)
I am not firm with these things... :-)
But all in all, sounds very good! I can estimate the turns N1... :-)
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Old 21st March 2017, 03:30 PM   #4
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If you are serious about building crossovers, you really need a LCR meter (inductance, capacitance, resistance). Or you could use a computer based measurement tool. I think the DATS (Dayton Audio Test System) measures inductance. You can't trust the marked values of inductors and capacitors.
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Old 21st March 2017, 03:56 PM   #5
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Yeah, I'll just look around for a couple of 4mH's... Thanks!
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Old 2nd April 2017, 12:21 PM   #6
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P24 from Lampizator didnt work for me...
I am trying something else now...
15" Woofer + 8" Saba Greencone + Saba Tweeter
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