Recent content by wolkegeist
  1. wolkegeist

    Fostex T50RP Incremental Mods and Measurements

    guys, I disassembled the driver and the magnet fell out of place due to poor glue. how to I install them back in the right order?
  2. wolkegeist

    Obscure Chinese DAPs

    I modded HD-X10, replace every big capacitor, swap SMD chip to OPA1612, swap big opamp to OPA1622 (best combo opamp from TI), but dropped it and one of the capacitor comes out due to my sloppy soldering. Now it's like a decoration that I hang on the wall to remind myself of the first time I try...
  3. wolkegeist

    Home-Made IEMs

    I don’t think the nozzle should be long, like maximum 3-4mm or something. If it’s too long you could accidentally jam it to your ears to hard that may leads to injury.
  4. wolkegeist

    Home-Made IEMs

    Which drivers are you going to use, because to my eye the shell cavity is quite small for multi drivers uses. Maybe make the body thicker and the tube shorter somehow.
  5. wolkegeist

    Home-Made IEMs

    Ahh it doesn’t matter how many pages it’ll take, I’m good at math lol. I’ll read both papers as soon as you post them. Gimme them knowledge!
  6. wolkegeist

    Home-Made IEMs

    Nice @dhruvmeena96 , but how do you measure/know inductance of drivers? I can’t find any paper about inductance of balanced armatures. This would really help me making zobel circuit.
  7. wolkegeist

    Home-Made IEMs

    Hey @dhruvmeena96, can you explain what is half tap and center tap is and what it does to drivers.
  8. wolkegeist

    Home-Made IEMs

    It’s the FED-30048. EST should be crossed at 13kHz up to 14kHz, it’s better to be a super tweeter, it still need a tweeter.
  9. wolkegeist

    Home-Made IEMs

    I tried many different type of caps man, idk about knowles caps but they’re probably X5R caps. For audio I think film caps and NP0 caps are the kings because of their low drift rate. But film caps are huge so they probably not gonna fit in a shell tho lol
  10. wolkegeist

    Home-Made IEMs

    The ED-30761 is a surprisingly good woofer, check it’s frequency response chart man. 1700 is mid, 2389 is upper mid/tweeter. The ED one is very tricky because it has no nozzle, I have to use tube shrink to connect it to the tube. I used Craft Arrange UV resin for the shell, and A-B resin for...
  11. wolkegeist

    Home-Made IEMs

    I used LS400 driver, which is a combination of Sonion 1700(??) and Sonion 2389, which is kinda similar to 1723 but without acupass. Formula as below: 2389 +2.2uF 1700 parallel 20ohm series Then a Cpad of 50ohm parallel and 3.3 ohm series. This is for a little bit of attenuation. Tube is 14mm 2ID...
  12. wolkegeist

    Home-Made IEMs

    Oh I read some paper about impedance equalization circuit of speakers, the parallel RC zobel is to flat out the impedance of high frequencies, and then another parallel LRC circuit is to flatten the impedance peak due to Eddy’s current. But it has the very confusing value of Qes and Qms, which I...
  13. wolkegeist

    Home-Made IEMs

    Anyone tried dual RAF + RAB 32257 + a dual tweeter? I'm thinking RAF series, 20ohm series RAB 32063 all in zobel 41ohm 4.6uF then SWFK crossed in 940nF
  14. wolkegeist

    Home-Made IEMs

    There’s a common formular: R=1.25*Z C=L/R^2 Z is the impedance of the driver L is the inductance of the driver The problem is to find the inductance of said driver tho.
  15. wolkegeist

    Home-Made IEMs

    I asked him but he said he won't order them anymore, he thinks E25ST0001/D is better than E25ST0002/D. he said alot of sonion's driver from China are made in Vietnam, which is where i live ha ha. I'll contact the local branch and see what happen. I'll update later
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