well in push pull i believe the increasing forces because the foil is getting closer to the stator are i believe the same (but reversed) on the other side. the forces become les and less. wich makes it an ideal push pull. (one loses controll the other oen gains control in proportion) (if you...

interesting ! but it is not a complete push pull. i mean forces are not pushing and pulling on one of the foils. its more like two single ended ones helping each other. so the one stator acts like the foil would in a inverted esl (but then in single ended mode). in a normal inverted you would...

hmm i beleive 3.3Kv for 1 mm is most common. 2150 would make 4300 volt. also dont forget potential difference i think ? like stators 500 ? then minus the 500 from the max bias so for a 3.3Kv a gap that corresponds to a distance of a gap that wont arc at 3.8 Kvolt. still with high excursion the...

Atistatic 100 isnot permanent. An based or moisture. Not the mosr r +360 on 2 mebranes ? is this like stacked ? 2 complete esls sandwiched 4 stators 2 membranes ? :) since you can get away with 3 stators if you reverse the polarity of the bias on the second foil. i did that in a 2 3 and 4...

you need a method to replicate, either use the weight method (placing a weight onto the original until you hit the stator and use that as reference for your new foil) or the method i used with a speaker and REW in this video. but for such small things i think the weight might be the easiest...

problem is mostly we are comparing apples with pears.. a headphone has a really low resonance compared to a tweeter like this. the tweeter would not even function without allot tension at high bias voltages since the slightest imperfection in terms of equilibrium would make the foil stick to...

if the main membrane resonance is indeed 100 or 500 hz i am absolutely wrong !! but i cant think of a panel having such high resonance if it has to do fullrange (i thought it was about a headphone). for a tweeter it does not matter indeed since cover has lower res then the frequency the thing...

breakdown of air is around 3 Kv a mm I think it was a little thicker spacing but, one must not forget that the pcb stator itself has the copper on the outside, so it is 0.5 + thickness of the stator almost. wich makes it possible to use 1.5kv since 1.5 would be the breakdown voltage of the 0.5...

yeah resonance of the dust cover in combination of the foil resonance creates a new combined resoanance so it should be stretched very lightly. at the same time the dust covers thickness adds up to the membrane thickness. so a 3 micron membrane with 2 3 mincron dust covers behaves more like a...

i still wonder why dustr is such a problem.. it never is with tweeters with 1mm spacings and far higher biases in the regions of 3Kv........ headphones..... few hundred adding dustcovers just like quad did moves the upper ferquencies exactly the same way it does as using thicker foil :). i...

hmm well i am no expert at all with ESL headphones, or even esl's i used the speaker method on bigger panels. i think it might be hard to pull off on headphones. maybe the weight thing might be the easiest method for a headphone. not sure what anitstatic you sued and what material is on the...

Never done 57s as well i dont know the components you mention. They are i guess 57 (only) related. I know they used a weird coating and 2 different types of foil. But cant help you there. Indeed ask the fellow diyaudio members. But most of all use the search butten over there or just google...

yeah i noticed :) closed is a nono :)

Lets Wrap it up!! last part of the Diy Planar Magnetic headphones Build - Part 9 Final and Doing some modding. i explain some problems i had, and why i converted it to open back.

And Part 8 And yeah part 8 of The DIY Planar magnetic Headphones. Assembly of the components. there will be a last part where i modify a few things. its a long and slow video. since it was few hours past midnight :) have fun