Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

Coil for woofer DIY 3 way
Coil for woofer DIY 3 way
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 20th March 2017, 07:02 PM   #1
hifisucks is offline hifisucks  Germany
diyAudio Member
 
hifisucks's Avatar
 
Join Date: Apr 2009
Location: Germany,17039 Wulkenzin OT Neuendorf
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!
  Reply With Quote
Old 21st March 2017, 02:51 AM   #2
Ron E is offline Ron E  United States
diyAudio Member
 
Ron E's Avatar
 
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
  Reply With Quote
Old 21st March 2017, 03:20 PM   #3
hifisucks is offline hifisucks  Germany
diyAudio Member
 
hifisucks's Avatar
 
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... :-)
  Reply With Quote
Old 21st March 2017, 03:30 PM   #4
Speaker Dude is offline Speaker Dude  United States
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.
  Reply With Quote
Old 21st March 2017, 03:56 PM   #5
hifisucks is offline hifisucks  Germany
diyAudio Member
 
hifisucks's Avatar
 
Join Date: Apr 2009
Location: Germany,17039 Wulkenzin OT Neuendorf
Yeah, I'll just look around for a couple of 4mH's... Thanks!
  Reply With Quote
Old 2nd April 2017, 12:21 PM   #6
hifisucks is offline hifisucks  Germany
diyAudio Member
 
hifisucks's Avatar
 
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
  Reply With Quote

Reply


Coil for woofer DIY 3 wayHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Anyone ever take apart a Jensen M-10 Field coil woofer? tom1356 Full Range 0 20th September 2010 09:28 PM
Where can i get a DUAL COIL WOOFER (INDIA) rikhav Multi-Way 1 8th October 2006 10:54 AM
Driving double coil woofer cld1354 Solid State 1 23rd April 2003 11:28 AM
Blown woofer- Coil replace or Passive Radiator CarMan Multi-Way 9 17th April 2003 02:40 AM


New To Site? Need Help?

All times are GMT. The time now is 04:41 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki