Material life-expectancy - Page 2 - diyAudio
Go Back   Home > Forums > Commercial Sector > Manufacturers > Markaudio

Markaudio Designers and builders of audiophile grade drivers

Reply
 
Thread Tools Search this Thread
Old 24th June 2010, 04:30 PM   #11
diyAudio Member
 
markaudio's Avatar
 
Join Date: Nov 2008
Quote:
Originally Posted by borispm View Post
Mark, thanks very much for your lesson. I think I can understand what you're saying now. I will try to be humble and read more before suggesting these.

I would however want to know why you would have given up on metal cones if the anodized layer can become thick though...

BTW, I've heard that the cone profile also affects the cone behaviour. Is the "exponential" profile more suitable as a full range driver than a straight profile one?
Boris, It's not about teaching you a "lesson" or trying to make you humble.

I'm trying to encourage you to be more investigative, learn more, further develop your knowledge base, then you'll be in a better position to make assessments.

It's been one of my issues that in Hong Kong, under-graduate and post-graduate education does not do enough to help students learn the powers of investigation. When I was a post-graduate in the UK, the first thing we were told was to: "make a contribution to original thinking". Its quite a challenge for students but a worthy one. It means you have to carefully propose any theory or ideas, offer testing and evaluative solutions to prove said theory/idea is viable; And VERY carefully evidence (et.al) your scholastic work.

You seem like a bright guy, a student with much potential, hence my efforts to get you to think more.

So, why have I given up on thicker coatings? Re-read my previous posts, there are several clues. Do some web research on acoustic emittance, cones and full range drivers. Come back to me on this thread with your findings and I'll help you further. But I want to see you try to figure out what a cone does and how it works.

Cheers

Mark.
  Reply With Quote
Old 25th June 2010, 05:00 AM   #12
borispm is offline borispm  Hong Kong
diyAudio Member
 
borispm's Avatar
 
Join Date: May 2010
Blog Entries: 1
Send a message via MSN to borispm
Mark, I think I know the answer now, please let me know if it's the correct one.
First, the anodized layer is hard but brittle so it will stop performing as a perfect piston at higher frequencies and is prone to have a breakup mode in those frequencies, something like 6kHz to 8kHz so that's why those deep anodized cones are usually used in woofers. (Just a conclusion after reading about the aluminium woofers from SEAS and peerless) Such peaks caused by the cone breakup mode is a nightmare for full range drivers. With a more elastic coating, there will be less ringing and softer peaks.

Best regards

Boris
  Reply With Quote
Old 25th June 2010, 05:47 PM   #13
diyAudio Member
 
Join Date: May 2010
I also say thanks for the information.

I just wanted some information about about the duration of drivers in general and about the ones I have already bought. Just in case my posting sounded derogatory, that was not my intention.

I am glad to hear that the ageing of your products is simulated.
  Reply With Quote
Old 25th June 2010, 10:45 PM   #14
diyAudio Member
 
markaudio's Avatar
 
Join Date: Nov 2008
Quote:
Originally Posted by chairforce View Post
I also say thanks for the information.
I just wanted some information about about the duration of drivers in general and about the ones I have already bought. Just in case my posting sounded derogatory, that was not my intention. I am glad to hear that the ageing of your products is simulated.
No problem and understood.
Thanks
Mark.
  Reply With Quote
Old 25th June 2010, 10:52 PM   #15
diyAudio Member
 
markaudio's Avatar
 
Join Date: Nov 2008
Quote:
Originally Posted by borispm View Post
Mark, I think I know the answer now, please let me know if it's the correct one. First, the anodized layer is hard but brittle so it will stop performing as a perfect piston at higher frequencies and is prone to have a breakup mode in those frequencies, something like 6kHz to 8kHz so that's why those deep anodized cones are usually used in woofers. (Just a conclusion after reading about the aluminium woofers from SEAS and peerless) Such peaks caused by the cone breakup mode is a nightmare for full range drivers. With a more elastic coating, there will be less ringing and softer peaks.
Best regards
Boris
Hi Boris,
You're beginning to have an idea but you still need to go back to the primary form and function of a cone. Continue researching. Concentrate on the physical properties that a full range cone needs to have in order to function.
Cheers
Mark.
  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
Ear Fatigue ccdoggy Car Audio 6 26th February 2007 06:04 PM
listening fatigue of Proac 2.5 clone kevinkuang Multi-Way 2 9th April 2005 04:42 PM
which amp has had the least ear fatigue? JZatopa Everything Else 8 28th March 2005 03:30 AM
Hornloading, fatigue, comb filtering... walker Multi-Way 1 20th November 2001 08:55 AM


New To Site? Need Help?

All times are GMT. The time now is 07:22 AM.


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