Anything wrong with using very high open area ESL stator?

chinsettawong · 9th November 2009, 06:38 AM

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.

Wachara C.

JarreYuri · 9th November 2009, 05:09 PM

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.

chinsettawong · 10th November 2009, 12:47 PM

Hi JarreYuri,

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

Wachara C.

JarreYuri · 10th November 2009, 01:22 PM

Softer as in "lower", yes.

Few · 12th November 2009, 02:06 AM

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

chinsettawong · 12th November 2009, 04:50 AM

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.

chinsettawong · 12th November 2009, 06:30 AM

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.

JarreYuri · 12th November 2009, 06:47 AM

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.

chinsettawong · 12th November 2009, 07:01 AM

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.

Calvin · 12th November 2009, 07:02 AM

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

9th November 2009, 06:38 AM	#1
chinsettawong diyAudio Member Join Date: Jun 2006	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. Wachara C.

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9th November 2009, 05:09 PM	#2
JarreYuri diyAudio Member Join Date: Oct 2006 Location: Uppsala	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.

10th November 2009, 12:47 PM	#3
chinsettawong diyAudio Member Join Date: Jun 2006	Hi JarreYuri, Does that mean the sound could be softer as compare to a less open area stator? Wachara C.

10th November 2009, 01:22 PM	#4
JarreYuri diyAudio Member Join Date: Oct 2006 Location: Uppsala	Softer as in "lower", yes.

12th November 2009, 02:06 AM	#5
Few 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

12th November 2009, 04:50 AM	#6
chinsettawong diyAudio Member 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.

12th November 2009, 06:30 AM	#7
chinsettawong diyAudio Member 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.

12th November 2009, 06:47 AM	#8
JarreYuri diyAudio Member Join Date: Oct 2006 Location: Uppsala	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.

12th November 2009, 07:01 AM	#9
chinsettawong diyAudio Member 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.

12th November 2009, 07:02 AM	#10
Calvin diyAudio Member 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

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