Measurement Setups - Post Your Rig!

Decided to grab a behringer ECM8000 and do something like this with my 3d printer: https://homebrewheadphones.com/design/testing-your-design/

Should be all set now.

 

Experimenting with silicone ears. They're not quite as soft as my ears and slightly smaller, but that's just nitpicking. They are soft and ear sized.

The main problem right now: I realized that you can't get good measurements like this without a good middle ear simulation, which won't be easy.
Multiple volumes with the right damping. The B&K 5128 (4620 ear) uses at least 3 from what I can tell, maybe more. I don't want to just attach an aliexpress IEC711 coupler - that would be too easy. I actually want to make my own and the idea is to be able to fit larger microphones.

Even without attaching them to a head (I do have a head here, just haven't made a hole for the silicone ears, yet) the FR curves I get from measuring speakers look promising and they mostly work for compensating the headphone measurements.

This will take a while, but I want to make my own dummy head/HATS. I want it to be slightly more damped than the current solutions since those seem to be more resonant than real heads:

The 5128 does seem to be the most accurate between 100Hz and 5kHz, which I would categorize as the most important range, but doesn't seal as well and also has sharper resonances.

It could take forever to get it to where I want it to be. However here are some WIP compensated measurements of my modded HD600 and modded HD800. I think there should be a bit more ear gain, but I do have to admit that the HD800 is still lacking in upper midrange energy, despite the mods.

 

New project: A new rig for measuring impedances.

I used 100W power resistors, gave it 4 channels, 2 XLR and 2 RCA. I used symmetrical power resistors on the XLR to give it extra power handling capabilities. 10 Ohm as a reference for both. And then I put it all in the smallest box I could find to house it all.


Now I'm under no illusion that I can pump 600W into this tiny thing for more than probably a couple seconds tops, but I just tried it at 2x40W and it took maybe 15 minutes to reach 70°C on the outside, which is when I stopped. The thermal adhesive seems to be doing a fine job.
I wanted to be able to test drivers at higher voltages to check how the impedance would change. And simply have a nice box for impedance measurements.

Why? Because earlier all I had was just a 1/4 W resistor that I soldered between two RCA cables with another RCA as a source input. Thin wires as leadouts. All of the cables very short. It was terrible and I'm glad I no longer have to deal with that.

Forgot to mention: This thing is heavy! 770g