|
SpeakerTalk This forum has been set up to facilitate discussion of 1970s KEF speakers and drive units. The owner of the Forum has no connection with KEF Audio.
|
View previous topic :: View next topic |
Author |
Message |
iso Senior Contributor 200+
Joined: 29 Aug 2011 Posts: 215 Location: Finland
|
Posted: Sun Aug 03, 2014 6:18 pm Post subject: Crossover inductors near magnet assemblies |
|
|
How close to the speaker magnet it is safe to locate crossover inductor? In LS3/5A design crossover PCB is only few cm behind T27 magnet.
In my Cantata rebuild, I noticed that crossover bolted to aluminium face plate caused some interaction between coils. It seems resonable to expect that magnet assemblies do have similar effect. Do tweeter, woofer, alnico and ceramic magnets have similar effect to nearby coils? Are air- and ferrite-cored inductors similar in this respect? How far from magnets you should place the coils, if good performance is needed?
Best Regards
Kimmo |
|
Back to top |
|
|
audiolabtower VIP Contributor 500+
Joined: 06 Jan 2009 Posts: 686
|
Posted: Sun Aug 03, 2014 8:38 pm Post subject: |
|
|
The BBC designs, including the LS3/5a used radio metal core transformer inductors. These had much better overload characteristics than normal inductors and less leakage due to the closed core keeping the magnetic field within the inductor. This is why the 3/5a gets away with mounting the pcb where they do. Conventional ferrite or much better (used in the Reference series) iron dust inductors need to be mounted a right angles on the pcb because of leakage and need to be more carefully sited compared to very strong magnets. |
|
Back to top |
|
|
|
|
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|