and
work fine with my FP 4.
Perhaps we could make a wiki with all the tested adapters?
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I created one, based on the SD card wikis,please add the adapter over there and use this topic here for metadiscussions
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My fairphone 4 arrived and I tested the Apple DAC with the special thingy I have for my hearing aid that functions as a wireless microphone/jack-equiped sound streaming adapter.
I can’t yet comment on the quality, but I can say that the maximum volume was way too low. Much lower than the maximum I can get from a phone with a headphone jack. So low I couldn’t hear the subtle parts of a song.
I solved the problem by downloading a headphone sound booster app and increasing the maximum.
I think the problem here is that the default maximum for USB C audio out on android is set too low, it appears to be a common problem. The fact that such booster apps exist seems to support this theory.
I will do more testing and report back if I find evidence to the contrary.
If anyone with other brands of usb-c to audio adapter wants to check this, simply see if the maximum volume you can set when using the adapter is lower than when using the same listening equipment (headphones, earbuds, speakers, etc) on a phone with a headphone jack. Take care to not hurt your ears! 
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The Apple “USB-C to headphone Jack” adapter also works.
Audio tested with a video and mic tested with the voice recording.
@FairlyAutistic to keep the wiki clean, I moved your comment to the metadiscussion, but edited as well the wiki to include your advice
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I think, if it doesn’t charge it is not fully functional. Or does it charge with an other combination of cable and charger?
Moving to the metadiscussion. thanks for the hint that we might need to move to “problematic”. I did not add it, @OvO can you give some feedback?
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Tested again today with the exact same combination - I couldn’t reproduce the issue and simultaneous charging works now.
Edited as a fully functional audio adapter because the audio works - but I understand your view - thanks for the input.
If the issue comes up again, I’ll keep the Wiki updated.
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The Delock 65842 works fine with fp4. Interesting is, that they say which dac Chip they use (cmedia cm119B).
https://www.reichelt.de/adapter-usb-c-stecker-klinkenbuchse-delock-65842-p207729.html?&nbc=1
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I have tested some adapters because I wasn’t sure which ones would work. Of the 3 different models of UGREEN I tried 2 didn’t work(the “newest” worked). Another adapter from another brand did work.
These Worked:
https://www.amazon.nl/-/en/dp-B082WG5VTK/dp/B0865G5PPD?th=1
https://www.amazon.nl/-/en/dp/B094WYY4TN
These didn’t work:
https://www.amazon.nl/-/en/dp/B07XPMGZYV
https://www.amazon.nl/-/en/dp/B07MCT2684?th=1
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I’ve been using the Fiio BTR3K, which technically isn’t a USB DAC but it can work as one. I’ve been daily-driving it in USB DAC mode and I haven’t run into any issues. Also added to wiki.
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The working ones are DACs, the other, cheaper ones only mechanical adapters. They can’t work on the FP4. The list of compatible devices is a lot shorter, only some Huawei or One Plus models.
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Finally trace an audio adapter in a local shop. It seems to work fine for me.
Some more experience (I wasn’t able to update the wiki):
- TINICR, https://www.amazon.de/gp/product/B07WZN9QXM charging worked, phones did not.
- UGREEN 90°, https://www.amazon.de/gp/product/B08TR7LWQH works nicely, including microphone and the control button, audio seems to be good.
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Could you please check your link to the UGREEn, please (did you copy the link while logged in?)? It doesn’t work for me and I see a lot of UGREEN 90 products there on Amazon.
sorry, somehow colons found their way into the links, I removed them, the links should now work.
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I got some AKG wired earplugs which are USB-C (came with a S20?) they work fine with FP4. Even control buttons work.
Those are the Samsung AKG earbuds, right?
Yes, they came included with the S20 (EE variant).
I just created an account to share that the Apple usb-c adapter isn’t playing nicely with my FP4. There is a persistent hiss/white noise when sound is playing (weirdly not when there is silence). I’ve tested the adapter with a set of Marshall Mode wired headphones, as well as my Sennheiser HD380 cans. The result is the same.
To find out what the culprit was, I tried to test several scenarios: The adapter produced the same white noise on another phone (ZTE Axon 7), but it produced an excellent sound on a laptop (Dell XPS). So I’m not sure what’s wrong here. The adapter is clearly not broken, but neither is the USB-C port of the FP4.
I will now order one of the other recommended adapters to test if they work.
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