Anything wrong with using very high open area ESL stator? - diyAudio
Go Back   Home > Forums > Loudspeakers > Planars & Exotics

Planars & Exotics ESL's, planars, and alternative technologies

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 9th November 2009, 05:38 AM   #1
diyAudio Member
 
chinsettawong's Avatar
 
Join Date: Jun 2006
Default Anything wrong with using very high open area ESL stator?

Hi,

I have read from a few places that the open area of ESL stator should be around 20-40% also the hole size should not be more than 4 mm. What if I were to use a lot more open area stator, what downsides can they be?

I'm now making a pair of ESL using 6 mm hexagon holes on 1 mm perforated metal sheet. Honestly, they actually sound wonderful. The only thing bad I can see is that 1 mm in thickness is rather floppy.

Visually, they look wonderful, too.

Click the image to open in full size.

Wachara C.
  Reply With Quote
Old 9th November 2009, 04:09 PM   #2
diyAudio Member
 
Join Date: Oct 2006
Location: Storvreta
One thing is that it will get less and less effective with larger holes.
In other words, every hole is an area that is not "active" in soundproduction.
And smaller holes (more metal) will restrict the air motion.
  Reply With Quote
Old 10th November 2009, 11:47 AM   #3
diyAudio Member
 
chinsettawong's Avatar
 
Join Date: Jun 2006
Hi JarreYuri,

Does that mean the sound could be softer as compare to a less open area stator?

Wachara C.
  Reply With Quote
Old 10th November 2009, 12:22 PM   #4
diyAudio Member
 
Join Date: Oct 2006
Location: Storvreta
Softer as in "lower", yes.
  Reply With Quote
Old 12th November 2009, 01:06 AM   #5
Few is offline Few  United States
diyAudio Member
 
Join Date: Apr 2004
Location: Maine, USA
The hole size can be usefully compared to the stator-diaphragm distance. If the holes are small compared to the stator-diaphragm distance then the electric field is less likely to vary significantly from one point on the diaphragm to another. If the holes are large compared to that distance, some areas of the diaphragm (those near the holes) may be driven with less force. You'll likely lose a bit of SPL, and it seems to me (without evidence to back it up) that you risk introducing some non-uniform diaphragm motions.

Few
  Reply With Quote
Old 12th November 2009, 03:50 AM   #6
diyAudio Member
 
chinsettawong's Avatar
 
Join Date: Jun 2006
Hi Few,

I have been listening to this ESL for a few days. Compare to my previous one that uses 3 mm round holes stator, the sound level is about the same. However, I like the openness of sound from this new ESL better. I am currently using 2 mm spacer.

Wachara C.

Wachara C.
  Reply With Quote
Old 12th November 2009, 05:30 AM   #7
diyAudio Member
 
chinsettawong's Avatar
 
Join Date: Jun 2006
I have been thing about it but I've not or dared not try yet. Even with very good stator insulation, if you put your finger or hand on the stator while playing the music, how high is the risk that you will get a shock? Will the more open area stator be more dangerous?

Wachara C.
  Reply With Quote
Old 12th November 2009, 05:47 AM   #8
diyAudio Member
 
Join Date: Oct 2006
Location: Storvreta
Personlay, I have been holding the cables for the treble stator on my QUADS just to feel the effect. hehe
No problem.
It's all about how loud You are playing. Louder - Higher V.
  Reply With Quote
Old 12th November 2009, 06:01 AM   #9
diyAudio Member
 
chinsettawong's Avatar
 
Join Date: Jun 2006
Hi JarreYuri,

Do you mean that you have tried touching the treble stator of Quad when you are playing music? That must have been very scary.

Frankly, I've been thinking whether I should put a protective cover for the ESL. I intend to put the ESL in my living room, and who knows maybe someone would like to touch it when the music is playing - especially those who don't know what ESL is.

Wachara C.
  Reply With Quote
Old 12th November 2009, 06:02 AM   #10
Calvin is offline Calvin  Germany
diyAudio Member
 
Calvin's Avatar
 
Join Date: Nov 2004
Location: close to Basel
Hi,

the risc of shock or flashover depends on:
- the shape of the conductor
- the thickness of the insulating material layer
- electrical properties of the insulating material
- quality of the insulative coating (e.g homogenity)
- duration of signal stress
- age of DUT
and maybe some more.
Openness of the stator probabely doesn´t play a role, at least not a major one.

jauu
Calvin
  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
Driver suggestions for high output open baffle speaker paulspencer Multi-Way 27 14th August 2013 01:16 PM
Looking to "Borrow" an Amplitrex, 539C or other High-End Tube Tester in SE PA Area baileyler Swap Meet 0 14th January 2009 02:07 PM
High reliability stator coating j beede Planars & Exotics 2 18th January 2008 09:08 PM
Is % open area the wrong parameter for ESL stator design? Few Planars & Exotics 6 23rd May 2007 09:58 PM
Open loop gain (High or low) ? JensRasmussen Solid State 19 16th September 2002 09:26 PM


New To Site? Need Help?

All times are GMT. The time now is 04:10 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