chinsettawong
Headphoneus Supremus
maybe the plates isolated.
quad 57 treble (squacker + tweeter) using 0.5mm and 1.5kV
the must DIY makers proffer to put the dust filter on headphones
after squashing it like this,
claimed that else it will damage some frequencies
on quad 57 guide it says to put it normally without stretching and some suggest to use some heat-shrink membrane and heat it.
squash like this
I think that humidity makes more sound distortion then dust, you will hear it without any sound from the headphone, the dust cover or some felt layers the only that can protect from it.
if it shorted (on headphones) you will hear really distorted low sound, on speakers I read that if you forget to put the resistor, all the diodes will blow (so DIY headphones to).
Are you sure that the treble panel on Quad 57 has only 0.5 mm gap? I don’t think you can bias 1.5KV with that small gap.