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Looks like I got one

For the bargain hunters out there.

While being stuck home, recovering for the past two weeks, I finally got round to doing some more DIY electrostatic headphones. I wanted to try out some different materials, 2um mylar and Comfort fabric softener to do the resistive coating. I must say both worked well and if the Comfort stuff holds up long term, it is a damn good coating that costs pretty much nothing. First off my long standing test drivers in a Superlux HD330 housing... as I had some donor headphones in stock. I made a few of these but this set has the Stax wide PC-OCC cable and Dekoni Fostex hybrid pads. I've made so many of these drivers over the years that they are a good benchmark and they perform flawlessly. Charge up instantly, no charge migration or issue with humidity that I can detect. The drivers are also modular so easy to assemble and test: I didn't even spring for ENIG on these but yeah, super simple design that just slots into the Supelux housing. They are just a bit on the small side for my head and the partially closed housing has issues but it's a fun set to play with. Next up is a set of SR-5's that had severe imbalance. Time for a new set of diaphragms with the thicker spacers I made 10 years ago or. I simply replace the stock diaphragm and this converts them to Pro bias too. Throw on there an old Lambda cable which had a break at the cable entry and it's a great little set of headphones. I love the SR-X Mk3 drivers and they are fun to play with. It is a bit challenging to fit the thicker spacers into the normal bias housings as it can warp the drivers but not a big deal really. Then I put on some leather earpads from my stash and yeah, a great SR-5 Pro... something Stax really should have sold back in the day. While I was making the diapgragms for those SR-5's, I made a couple of more for a spare set of drivers which resulted in this: I'm always on the lookout for cheap open back headphones which can be "easily" turned into electrostatics. This is a Fiio JT1 which was less than 60$ shipped but is not ideal for the conversion as the baffle is not flat due to how the earpads are mounted. Still nothing a circular saw can't fix: I covered the stock holes with tape to seal the baffle and keep the glue out when I fitted the driver: The PU two part adhesive covers all the baffle vents and I put some tape on the earpad attachment points to just keep the glue out of them. Worked just fine and the seal is great No damping at the back and they are open enough. I fitted strain reliefs at the cable entry and plugs to seal off the top vents in the housing as well. This one has the stock earpads and the cable is the standard silicone 6 core stuff floating around with an aluminum cable splitter for the Y split and a prototype plug I was sent a while back. Pretty nice sounding set of headphones that don't cost a lot to make. Granted you need a SR-X Mk3 to donate the drivers and some custom spacers to make it work but I'd want to make something like this with custom drivers. It would be a great DIY project to release, buy this set of headphones, rip out its guts and make your own drivers from these PCB's. The cable is easy to source, so are the cable entry glands and a Stax plug can be 3D printed with basic XLR housings. Finally, a bit of a closure for me with what is probably the final version of the HD580/600/650 electrostatic conversion above. I was always battling baffle leaks on those as it is impossible to shave the stock baffle completely flat. I might try to laser cut a neoprene gasket or something like that but on this one I simply designed a new protection grill and glued that to the baffle. Not ideal but it works nicely. Then new stators and new spacers for the diaphragms and dust covers. The cable is the King Sound KS-H4 unit so it is removable. I just shaved down the socket a bit and glued it into the stock holes. The protection grill which is glued to the baffle. Earpads are the hybrid units Drop used to sell and then sheepskin headpad. New stators with full ENIG plating and purple solder mask because reasons. :) These do sound great if I dare say so myself, very much on par with the HE60 but with a fuller sound. Same spacing at 0.5mm so sensitivity is very close too to stock Senn units. Funny for me as the HD600 was my first ever high end set of headphones, so when I found this set with broken drivers it was an ideal candidate for conversion. Full circle and all that shit...

Also kinda

Just for future info: diskutil unmount /dev/disk1s2

Brief update on this issue: To securely wipe an HDD, it's necessary to do one pass with Disk Utility first, then make use of the Terminal command. This is because Terminal itself can't unmount a disk. Also, in possibly related news I have a stack of six HDDs to donate to the local second hand shop.