Superlux hd681 / AKG k240 detachable cable mod
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A piece that attaches to a pair of AKG k240 or other clones that will hold a mini xlr connector
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- Printables
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- Audio
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- Creative Commons — Attribution
I wanted a way to add a mini xlr female connector to my Superlux hd681 headphones. There is an existing design, but it looked too fragile and does not use a mini xlr connector. This part allows you to use a 3 or 4 pin mini xlr.
I need to warn you, This is not an easy mod.
I recommend connecting wires to the socket BEFORE installing it. The wires that are in the original cable contain Kevlar and do not solder well. There is very little room so the wires need to be extremely short and thin.
Printing
Print with flat part (where the mini xlr sits against) on the build plate. Enable tree support. I used petg but pla will most likely work just as well. Using a more heat resistant polymer is a good idea, as it will make soldering easier
Disassembly
You need to get the decorative cap off that says HD681 - 2x32 ohms. Get something thin and sharp under it and it just comes off. Remove the PH1 screw underneath to get them open. Open the side with the cable on it. There is heat shrink around wires going to the left driver, be patient and remove the heatshrink and desolder the connector; the wires to the left driver would be a pain to reconnect. Also desolder the wires going to the headband; that is how the right driver gets it's signal
Soldering
As previously mentioned, I recommend connecting wires to the plug before installing, ESPECIALLY the pin #4, that's by far the most challenging, however you do not technically need to put any wires on. If you use wires, they need to be about 1 inch or 2.5 cm
Screw in the mini xlr connector using the male side of the mini xlr. Be sure at the end the button is facing outwards.
Start soldering wires according to the pinout of the cable you have. It's probably not standard, but here's the pinout I used according to the pins embossed on the mini xlr.
| 1. L+ | 2. L- | 3. R+ | 4. R- |
Inside there are both red and white wires, pick which one will be positive. As long as it's consistent, its good.
Assembly
Once everything has been soldered, screw in the side. There is also a file named ‘blank’ that you can use on the right side for it to match, or modify for whatever you want.
Resources and notes
My solder joints are not that good, but it's hard because you are always a second away from melting something or burning yourself. Again, it's difficult!