It´s time to think big.
No more coating, no more resistivity variations, or variations with humidity.
There is some companies making dissipative polyester film with resistivity 10^8
I have been in contact with a seller, and he will come back next week.
Can´t wait
My requirement is 3um and 8um and a surface resistivity around 10^8 on both.
3um for QUADs and 8um for something else..
No more coating, no more resistivity variations, or variations with humidity.
There is some companies making dissipative polyester film with resistivity 10^8
I have been in contact with a seller, and he will come back next week.
Can´t wait
My requirement is 3um and 8um and a surface resistivity around 10^8 on both.
3um for QUADs and 8um for something else..
would be verry helpfull. BUT, as in a quad 63 there are sections where there is no coating. and there is no coating for a reason, leakage to the frame for instance since the screws go trough the panel into the aluminum frame.
so i could imagine it is usable for some ELS's and would be great, but not for a quad 63 i wish it was different since im getting sick of the coating debate
so i could imagine it is usable for some ELS's and would be great, but not for a quad 63
i wish it was different since im getting sick of the coating debate
that would be an idea, but what to do in the middle sections ? where the screw is to connect front to back stator. they leave a circle free of coating. But maybe it is possible to get rid of the conductivity ? that would be awesome just clean the spots you dont want to be conductive
anyhow you can count me in for a group buy! you prob need to buy allot and im willing to buy allot if needed. if we know more about the product thickness and stretch-ability and how it behaves ofcourse
so we might need some samples. looking forward to his reaction.
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45um... a little thick, if you dont want to build a subwoofer as I want to do
45um... a little thick, if you dont want to build a subwoofer as I want to do
What is your experience then? With the material itself and not the claims in DS. I believe there's a company that utilize metalized film, actually two, sandwiched (glued) metal inside plastic outside. PET is transparent to gases - that's why wine bags are heavily metalized and coated with polyolefines.
If this would work in a wery large dipole for low frequensies 30-100 Hz I would be happy. A concern is that even though the surface resistivity is high maybe the middle layer metal film will gets charged as well and generate distortion. A low distortion membrane should have very high resistivity as we know. I guess the middle metal foil will be charged from the edges, where the different layer meets... bad bad. I know that Beveridge (Beveridge 2 SW 2 ) solved this and used high conductive metalized foil. I theink they sound very good every where in the room. But when switching over to the QUAD´s the staging is superior... Distortion vice the Beveridge is extremely good, so how did he get away with this? The answer is the different driving principle: http://ansaht.com/uv638jed4/BeverigdeIISW_sch.JPG
inverted esl ? audio on foil. HV on stator. ? but thats not the way to go. distortion wise.
Btw Quad esl 63 has a low resistance. although everyone tells otherwise. every panel i measured i get reading of few Meg 2-5 . thats not enormous and not in the range to counter migration if you ask me. you can even measure it with a crappy multimeter.
dont even need a megger.
Btw Quad esl 63 has a low resistance. although everyone tells otherwise. every panel i measured i get reading of few Meg 2-5 . thats not enormous and not in the range to counter migration if you ask me. you can even measure it with a crappy multimeter.
dont even need a megger.
I'd be concerned with charge migration through the very conductive central layer. That would make the panel displacement non-linear.
Also good modern coatings are largely unaffected by changes in humidity.
I keep the coating away from the corners and short edges of the panels in the 63's. I also have a small ring of un-coated diaphragm around the support pillar holes in the diaphragm. You need to leave a bit of space around the mounting holes to prevent the shorting of the diaphragm, but that can be a fairly small area.
Also good modern coatings are largely unaffected by changes in humidity.
I keep the coating away from the corners and short edges of the panels in the 63's. I also have a small ring of un-coated diaphragm around the support pillar holes in the diaphragm. You need to leave a bit of space around the mounting holes to prevent the shorting of the diaphragm, but that can be a fairly small area.
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