Let's make a pair of DIY headphones with best possible components. I'm sure they'll cost only a fraction of what they're selling, and they could sound as good too.
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About adding the thickness to spacers, you can try something as simple as a piece of paper. Last time when I measured, the 80 GSM A4, photocopy paper was about 100 microns thick.
Oh, it's good that the coating is still OK. Are there dust covers on the front and the back of the driver? Are they still in good shape? The dust covers if they are in good condition, should provide a pretty good shield against moisture. I wonder what that black wire on the drive is for.
It said that the driving Mosfets were inside the cups. Then there is no way that these haedphones can be driven by other amplifiers without serious modifications.
Yea, the noise could very likely come from leaky resistors. On mine, the leaky resistors not only caused noise, they also caused the active battery to be very unstable.