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This short could be relevant for your interests:

i am retired now, 7+ years. And loving it. Due to arthritis issues i am no longer working on any more equipment. including my own. going to pay a couple of high-school kids to stuff and solder boards and chassis etc for new projects.

LOL, I'm dieing. Seriously though, what if I use a legally obtained skull and fill it with something the same consistency as human brain matter? Please comment more as that was entertaining AF. Lol That is a Roland R-05, though it does kinda look like an old flip phone

guess i'm trying a mix MELF/thin film

I think the metal film resistors will work, they're used on the cfaelectrostat board in google drive. It's quite a bit bigger and you need two of them for one channel.

then let's find some other kind resistors 😁

The thick film resistors are still bit of a problem cause of drift. Even with the dn2540, turning the trimmer a little too high or low will still cause it to drift.

For legal reasons, you probably shouldn't actually say it. Where you source the head is non of our business. Is that a flip phone strapped to a portable amp? I have no business commenting in this thread. Good luck with your measurements.

Given how good I think the A7IV is, this is something I'll likely look for used in a few years. I really believe the sensor size is pretty idea. The A7RV I get to use at work now is pretty amazing but the file sizes are enormous and I often don't need that much resolution even for large (30"x40") prints.

Cool! Sorry if I added to the mess.

Oh, I misunderstood.... So I need an actual human head. Is this how Frankenstein starts???? I have a polar bear named Baloo in Minecraft, if I get another one I should name it Grawk.

Love it. How are you doing sir, still teaching? Any chance you'd take a glance at my McAllister mess/amp? I'd love to give it a refit.

has to be one of the ones that can be set to 12v like this Amazon.com: FARSENSE USB C to DC Adapter,Barrel PD Trigger Cable(3.3ft) with 10 Connector Tips,USB to DC Power Cable can Switch Voltage by Pressing The Key,Support LED Display Voltage : Electronics

Ok, interesting. So a Styrofoam head would be ideal and some sort of small size and highly sensitive microphone? Would the omnidirectional test microphone work, or are those crap. What about my roland device with some damping?

No. Not unless your head has the acoustics of styrofoam, the dummyhead needs to mimic the acoustics of a human head, mostly because of the proximity of your head to the microphones (earholes). The sound at the microphones is a very complex signal that is not just a function of the sound coming from the sound sources (unadorned live music -- throats and musical instruments; recordings -- speakers), but the HRTF that the acoustics of your head do to the sound as well. Paging @Dreadhead...

Who is making these???

Wait wut? Itll be so fun! *This is your left ear* They recommended the SM7B over on the other place over BEACN. Did I just stream of consciousness too hard. You ok Grawk? Need a mint?

Price? Sorry, I know I can google. They kinda look like omegas. How do they rate birgir?

This post just made me break out in hives

From an engineering perspective, hfm and stax differ in design in many aspects, the mesh stator alone cannot be used as a simple evaluation criterion. I would like to briefly discuss the following points: 1. Different Assembly Structures. Hfm uses glue to bond both spacers and stators, unlike stax driver house. Their assembly method also borrows from early Sennheiser and Sony design concepts, attempting to isolate the shell and driver vibrations through flexible coupling. In other words, if you disassemble any non-latest hfm headphone, you can see the driver is sandwiched between the EVA foam and panel on both sides. These three headphone assembly methods—"stax（driver house + rigid shell）," "senheiser、hfm（flexible coupling assembly）," and "completely ignoring vibration transmission"— will produce some differences in subjective listening, but these differences are not significant in the frequency response curve. 2. Different stator acoustic designs. Stax stator acoustic surface size is consistently significantly smaller than the diaphragm size. This design improves sensitivity a bit and also provides a gradient radial damping for the diaphragm. Limiting the acoustic surface size at the stator level is also one of the reasons why stax have a bit different image compared to other estats. 3. Different mesh counts. Stax uses lower mesh counts, such as 60-80 mesh in the Omega and x9000, while hfm uses higher mesh counts, around 300 mesh in the Shang JR/SR. Lower mesh counts result in more transparent sound waves, while higher mesh counts provide more uniform but higher damping, leading to audible differences in subjective listening, but there are no winners in this regard. 4. Different earpad and wearing design. This goes without saying, it greatly affects the sound of electrostatic headphones, and hfm and stax have almost opposite design philosophies. 5. Different diaphragm. Whether it's the thin film material itself(pet vs pps), the conductive coating, or tension, hfm and stax are all different.

A SRM212 with one of those USB to barrell jack adapters and run it off a normal USB power bank. 4W should be just fine of a 2A output.

at the moment, do what i did 30 years ago. srm212 plus 12v 7ah gel cell. its portable. kinda portable. or buy 4 x apex opamps and run them class C with the dc to dc converters. i wish i had a better solution. getting all those transistors to touch the heatsink at the same time is not easy. even the koss box requires a decent size battery. (6 x D cell)

Well, let's be honest, it was never portable. It consumes 600ma + more like 800+ for DC converters. No small battery can handle that—for example, 10 hours. Yes,we can use a power bank, but that won't be very portable.

Just checking out the local river as a result of the atmospheric River. not a good video and YouTube forced it to be a short which I hate. 🙃

no, omega-els has the hvrv-hansen portable. and the power supply blew up. so he is using outboard dc/dc converters to power the no longer really portable thing.