Coil for woofer DIY 3 way
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 Multi-Way Conventional loudspeakers with crossovers

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 20th March 2017, 07:02 PM #1 hifisucks   diyAudio Member     Join Date: Apr 2009 Location: Germany,17039 Wulkenzin OT Neuendorf 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!
 21st March 2017, 02:51 AM #2 Ron E   diyAudio Member     Join Date: Jun 2002 Location: USA, MN 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. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. —Aldous Huxley
 21st March 2017, 03:20 PM #3 hifisucks   diyAudio Member     Join Date: Apr 2009 Location: Germany,17039 Wulkenzin OT Neuendorf 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... :-)
 21st March 2017, 03:30 PM #4 Speaker Dude   diyAudio Member   Join Date: Oct 2005 Location: Benicia CA 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.
 21st March 2017, 03:56 PM #5 hifisucks   diyAudio Member     Join Date: Apr 2009 Location: Germany,17039 Wulkenzin OT Neuendorf Yeah, I'll just look around for a couple of 4mH's... Thanks!
 2nd April 2017, 12:21 PM #6 hifisucks   diyAudio Member     Join Date: Apr 2009 Location: Germany,17039 Wulkenzin OT Neuendorf P24 from Lampizator didnt work for me... I am trying something else now... 15" Woofer + 8" Saba Greencone + Saba Tweeter

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