This is a review and detailed measurements of teh 1More USB-C DAC and Headphone Adapter based on CX31993 IC. It is on kind loan from a member and is included in the 1MORE Penta Driver IEM.
This dongle looks like any other except that it didn't come with an adapter for USB-A host connection. It has a major problem though: the headphone socket is too loose barely making a connection. I barely got it working for this test. Whether they are all like this, I don't know.
1More USB-C Adapter Measurements
I was saddened to see that the output maxed out at just 1 volt instead of 2:
Combined noise and distortion is very good however for a dongle with distortion at threshold of audibility. Dynamic range is also very good at full volume:
But as you see, it is quite poor when the Windows volume was adjusted for nominal 50 millivolts:
It seems to have high residual noise which could be system dependent.
Jitter had a lot of random noise impacting the clock which may be related to above:
You can tell that from the wide "skirt" of the noise spectrum.
Output power is of course limited especially at 300 ohm:
Conclusions
I guess performance is what you expect for a "free" headphone dongle. Still, more could be done to optimize performance without a cost hit. The gain for example, is too low as both the 32 and 300 ohm measurements show no clipping. The fact that the headphone jack is broken doesn't inspire confidence as far as quality.
I can't recommend the 1MORE USB-C Dongle/Headphone Adapter.
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As always, questions, comments, recommendations, etc. are welcome.
Any donations are much appreciated using: https://www.audiosciencereview.com/forum/index.php?threads/how-to-support-audio-science-review.8150/
This dongle looks like any other except that it didn't come with an adapter for USB-A host connection. It has a major problem though: the headphone socket is too loose barely making a connection. I barely got it working for this test. Whether they are all like this, I don't know.
1More USB-C Adapter Measurements
I was saddened to see that the output maxed out at just 1 volt instead of 2:
Combined noise and distortion is very good however for a dongle with distortion at threshold of audibility. Dynamic range is also very good at full volume:
But as you see, it is quite poor when the Windows volume was adjusted for nominal 50 millivolts:
It seems to have high residual noise which could be system dependent.
Jitter had a lot of random noise impacting the clock which may be related to above:
You can tell that from the wide "skirt" of the noise spectrum.
Output power is of course limited especially at 300 ohm:
Conclusions
I guess performance is what you expect for a "free" headphone dongle. Still, more could be done to optimize performance without a cost hit. The gain for example, is too low as both the 32 and 300 ohm measurements show no clipping. The fact that the headphone jack is broken doesn't inspire confidence as far as quality.
I can't recommend the 1MORE USB-C Dongle/Headphone Adapter.
------------
As always, questions, comments, recommendations, etc. are welcome.
Any donations are much appreciated using: https://www.audiosciencereview.com/forum/index.php?threads/how-to-support-audio-science-review.8150/
Dam Lexus and it's electronics will last forever.
