The Type-C earphones connector looks the same on every pair, but it hides one of two designs. Some earphones carry their own digital-to-analog converter (DAC) and take digital audio from the phone. Others contain no electronics and need the phone to send analog audio through its USB-C port. That difference is the first thing to check when a pair plays on one device and stays silent on another.
The technical facts below come from Wikipedia’s USB-C article, and the problem reports come from two Reddit threads. EARSOLE has not tested any USB-C earphones or phones for this article.
Key takeaways
- Wikipedia describes two modes of USB-C audio output: digital and analog.
- Wikipedia says active adapters with a built-in DAC have near-universal support.
- Wikipedia adds that passive adapters are only compatible with devices that output analog audio.
- Wikipedia lists the analog USB-C audio mode as deprecated in the Type-C specification.
- Neither EARSOLE USB-C listing says whether a DAC is built in.
Two kinds of USB-C earphones behind one plug
According to Wikipedia, there are two modes of audio output from devices over USB-C: digital and analog. Adapters come in two matching types: active ones with a digital-to-analog converter, and passive ones without electronics. On paper, Wikipedia says the engineering specification does not allow an analog headset to use a USB-C plug instead of a 3.5 mm plug, so a headset with a USB-C plug must always support digital audio and could optionally support the analog mode as well.
| With a built-in DAC (active) | Without a DAC (passive) | |
|---|---|---|
| Where the sound is converted to analog | Inside the earphones or adapter | In the phone or tablet |
| Which devices it works with | Near-universal support, per Wikipedia | Only devices that output analog audio |
With an active pair, Wikipedia says the conversion by the DAC and amplifier is done inside the headphones or adapter instead of on the phone. With a passive pair, digital-to-analog conversion is done on the host device and analog audio is sent through the port.
Wikipedia calls the analog path Audio Adapter Accessory Mode and says the mode is entered only if the device supports it. In that mode, all digital circuits are disconnected from the connector and certain pins are reassigned for analog outputs or inputs. Wikipedia also says the mode has since been deprecated, with version 2.3 of the Type-C Cable and Connector Specification, to make way for a new Liquid Corrosion Mitigation Mode.
Why the same pair works on one device and not another
A device without analog output has nothing to send to a passive pair, while a pair with its own DAC brings the converter with it. That split explains why the same passive earphones can play on one device and stay silent on another.
On r/samsunggalaxy, a poster setting up a new phone wrote that their ordinary USB-C earphones produced “a notification saying it is not supported”. Both replies pointed to the same split. One said “you need digital usb c earphone”, and the other described two types of Type C earphones: active, digital earphones with a DAC, and passive, analog ones.
The split does not explain every case. On r/GalaxyS23Ultra, a poster said their USB-C earphones did not work on their Samsung S23 Ultra, although they had checked that their EarPods worked on a Samsung Galaxy Tab S10 FE and that their chargers and Samsung DeX worked through a USB-C cable. One reply asked whether the earphones had a built-in DAC. Another said someone had tested Type-C EarPods with that phone model and they worked. Later commenters said their earphones had worked before and then stopped being detected. The thread, as read for this article, did not reach a fix.
USB-C wired headphones with a microphone
The analog mode carries inputs as well as outputs: Wikipedia says certain pins are reassigned for analog outputs or inputs. That is the path a passive pair’s inline microphone uses, so a passive pair’s microphone depends on the same device support as its sound.
What to check before you buy or return a pair
- Read the listing for the converter. Look for the words DAC, digital or active. A listing that says none of them does not tell you which kind you are buying.
- Check your device’s support. See whether the phone or tablet maker documents analog audio output over USB-C.
- Try a second device. If the pair plays on one device and not another, the earphones themselves are working.
- Watch for pairs that stopped working. If earphones played on a phone before and then stopped being detected, the active and passive split is not the explanation, and the forum thread read here did not find one.
What the EARSOLE USB-C listings say
The White USB-C Earbuds with Inline Controls listing describes a semi-in-ear shape and inline controls, and says the wired design connects through a USB-C audio port.
The Black Red-and-Blue Ring USB-C Earbuds listing names red and blue rings, in-ear tips, a USB-C connector and an inline control.
Neither listing says whether a DAC is built in, and EARSOLE has not tested either pair on any phone. Until a listing states it, treat compatibility with a specific phone as unconfirmed.
What this guide does not cover
It does not list which phones output analog audio over USB-C, or which devices dropped it after the deprecation, because the sources used here do not give a current list. The forum material is a handful of individual replies, and the technical facts are an encyclopedia summary.
Do Type-C earphones work on all phones?
Not always. Wikipedia says USB-C audio comes in digital and analog modes. Earphones with their own DAC have near-universal support, while passive ones need a device that outputs analog audio.
Why are my USB-C headphones not working on my phone?
In the r/samsunggalaxy thread read for this article, both replies pointed to the difference between digital earphones with a DAC and passive analog ones. Wikipedia describes analog USB-C audio as a mode a device enters only if it supports it. In a second thread, later commenters said earphones that used to work had stopped being detected. The digital and analog split does not account for that.
