Hi first time poster here so please excuse some roughness.
In the last ~1,5 years I have built 3 headphones so far with rising challenge each time and i thought it might be interesting for other people to see aswell as give some ideas and feedback for my projects going forward.
I will post all three with my build process in chronological order in this thread.
This journey started with me looking for a good closed back headphone for a fair price that was also readily available here in Germany, but I became frustrated with the lack of actually good options. Then after seeing a comment on Resolves review on the ADX5000 which said that the whole driver assembly was available for a fair price I thought why not just build a headphone yourself. Starting open back and then advancing to closed backs. And thus my DIY ADX5000 was born.
For this the Build was fairly straight forward. I bought the replacement drivers some connectors for the already built in A2DC ports and then a headband on Aliexpress. As Body for cups I used a piece of Walnut which I turned to a pair of rings via woodturning.
I began with a thick circular piece and screwed it into the metal plate holding it onto the lathe. Then i turned first the outer part to get a nice curve and a diameter of about 110mm. Then I hollowed the inside out to get to an inner diamater of a bit more than 100mm.
After some sanding on the lathe I cut out the inner part, drilled 2 3mm holes in the sides for the headband and added the 6mm hole for the connector at a slight angle.
After a quick testfit I predrilled with the drivers in the cups the holes for some 2,5mm woodscrews to hold the assembly into the rings.
To protect the wood and add flair I gave the rings 3 passes with wood oil and lastly added a honeycomb aluminium grid in the back. For added comfort I replaced the knock off HD600 headband padding with a strip of soft brown leather as a comfort strap.
The tuning was done solely via the pad choice. I experimented with slight front dampening but was always unhappy with how transients and details felt after that so ended up just buying about 10 pairs of random pads and just listening. I began with a pair of leather angled pads with inner perforations. With those it sounded too sharp and unpleasant. I then turned to Brainwavz XL Suede with the Cooling gel. The Gel ones have a slightly smoother material which I simply found more comfortable. Aswell due to the Gel they begin being more Firm but mold to your head after a while.
After adding catears for the obvious 25% plus in detail I found them to be really nice for my tastes. Nice a bit forward Vocals and plenty of air without being fatiguing. The bass seems a bit wooly which I account to the rise at about 150hz and the continuous fall towards the sub bass.
I made some measurements which I validated as best as i could by ear. This is done on an absolutely non valudated rig so only take it as an indication and comparison to the added measurement of the Sundara. The rig consists of a Yamaha surround receiver measurement microphone with a 3d Printed human ear on there, so take this really with a grain of salt and just as an added indication for what ive built.
I personally hear the bump at 900hz and 2,5khz stronger while the dip at 5khz is more at 5.2khz and a lot less strong.
To get these just a tad closer to what I like a added some eq wth a slight bass tilt towards the subbass and less mid/upper bass and then added a bit upper mids until 3.2k with a reduction of 4k to 5k after that. Each with at most 3dB difference and all in all not really a neccessary or striking change.
In the future i will try a few more pads to see if I can get away as good as I can from EQ for more flexibility.
I hope this was atleast an interesting read. Please feel free to ask questions or leave feedback or advice. I hope to add the posts for the other 2 in the coming hours to days