Neodymium magnets vs Ferrite magnets - Page 3 - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range

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 12th November 2009, 03:09 AM   #21
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Kona, Hawaii
Blog Entries: 4
Quote:
Originally Posted by thoriated View Post
The ferrite drivers that replaced alnico versions were generally heavier due to the greater magnet mass required to give the same gap flux.
Quite true. Thanks for mentioning that. The Alnico magnets were mostly rod shaped. I.E. the magnet is the pole piece. So magnet geometry is different.
Don't know how the neo magnets are done.

Anyone?
__________________
Take the Speaker Voltage Test!
  Reply With Quote
Old 12th November 2009, 03:10 AM   #22
diyAudio Member
 
blueae1405's Avatar
 
Join Date: Nov 2009
Location: Omaha, NE USA
So it's all about looks when higher end speakers use Neo magnets? There is really nothin better that Neo has then Ferrite?


Do Neo magnets last longer and are they usualy durable? Since if that's the case maybe that's the biggest reason why they use Neo on higher end speakers.
  Reply With Quote
Old 12th November 2009, 03:31 AM   #23
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Hmm, you get higher magnet power on alnicos by increasing the length

On ceramics its the opposite, its more effective to increase diameter
Greater thickness gives less

Optimal size of ceramic magnet could easily end up being as big as driver mounting hole, or bigger, which isnt practical

In the old days with alnicos it sort of worked on its own
When forced to use ceramic instead problems began
Concerns flux variations caused by the moving voice coil

Oh, I actually forgot the only thing I wanted to say
One reason some use high power neos is because it really is the only way to get close to alnicos, and its cheaper
  Reply With Quote
Old 12th November 2009, 03:52 AM   #24
diyAudio Member
 
thunk303's Avatar
 
Join Date: Mar 2005
Location: Eltham, Melbourne, Australia
Neo is often the only choice when building something like a tweeter where a compact body allows placement much closer to the mid range driver.

Is that foam between the neo magnets on the Tangband?
  Reply With Quote
Old 12th November 2009, 04:26 AM   #25
diyAudio Member
 
Join Date: Jun 2006
Location: Columbia, MO
I think the small size of Neo magnets gives less restriction to the backside air flow. The lowest distortion midwoofer I have ever seen used Neo.
Ted
  Reply With Quote
Old 12th November 2009, 04:39 AM   #26
diyAudio Moderator Emeritus
 
Iain McNeill's Avatar
 
Join Date: Oct 2007
Location: Santa Cruz, California
The target application is important too. Is this a high power, high reliability application (e.g. 18" driver 200' up in a stadium scoreboard) or is it a portable music player (minimum weight, maximum efficiency)? Different strokes, YMMV, etcetc.

As I said, there's no best, just least bad - and its different for everyone.
  Reply With Quote
Old 12th November 2009, 04:43 AM   #27
mp9 is offline mp9  United States
diyAudio Member
 
Join Date: Jun 2006
a shielding cup is a mickey mouse way of doing it unless it's also enclosing a bucking magnet. they do helps in other ways too, think spendor.
  Reply With Quote
Old 12th November 2009, 04:44 AM   #28
diyAudio Moderator Emeritus
 
Iain McNeill's Avatar
 
Join Date: Oct 2007
Location: Santa Cruz, California
Does anyone have any data on the 'resilience' of the different magnets. What I mean is, when you put a big signal through the voicecoil it generates a significant magnetic field of it's own. How does neo respond to that counter field with respect to flux saturation in the core and dynamic range compared to ferrite & alnico?
  Reply With Quote
Old 12th November 2009, 05:00 AM   #29
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Barkhausen noise in drivers and inductors
Neodymium is now Mainstream?
Best Sounding Magnet!
does neodymium 'sound like' alnico?

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 12th November 2009, 05:09 AM   #30
diyAudio Moderator Emeritus
 
Iain McNeill's Avatar
 
Join Date: Oct 2007
Location: Santa Cruz, California
..without leaving the site

Thanks Dave!
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Neodymium magnets NickC Full Range 1 19th May 2008 10:41 PM
Neodymium magnets Geoff H Planars & Exotics 0 18th June 2007 01:59 PM
Neodymium Magnets Frazzled Everything Else 4 25th July 2004 06:42 PM
Neodymium Magnets sdman Multi-Way 7 7th January 2002 07:34 PM


New To Site? Need Help?

All times are GMT. The time now is 03:29 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2