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Question: Behringer UMC 204, Distortion on main out

Lilith

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Hi,

I'm just fiddling with my UIMC204 interface to see how strong the distortion is on its outputs and how it depends on the Main Volume.
I connected one channel of the outpout (which normally goes to my monitor controller) to the left input. I set the input gain so that it it does not clip at the input.
The signal of the left input I checked with a spectrum analyzer playing a sine tome at 1 kHz. I don't know the absolute levels, but what I get is this:
V4XoeGq.png


In red you see the signal from the PC and in cyan the signal that goes from the interface output into its input. There's significant amount of distortion. I don't know if this is comparable with Amirs measurements: https://www.audiosciencereview.com/...ringer-umc204-hd-audio-interface-review.9856/ but it seems worse to me.
The main volume in this case is at 100% (~5 o clock). When I dial the volume back a bit to ~2 o clock it looks better, but I'm loosing 12 dB of volume, which is not acceptable. Does anyone know if the unit is really that s h i t t y?

tABH0rY.png
 
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Lilith

Lilith

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and with REW... it's between ~0.5 - 0.8 % THD (0.8% at maximum output volume). :rolleyes:
This is when the UMC 204 is connected to an active USB Hub:

TAof39m.png


And this is when the hub is not powered. > more noise, more distortion.

40SspM2.png
 
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Lalaland

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I am going through the exact same test as you present on my UMC204, witch lead me to your thread. Found it was a good opportunity for me to register here and not just lurk around.
I got about the same results as you present, although I have been able to improve results a bit by fiddling with levels. I'll see if I can post a few measurements later, if you are interested. There is info out there about possibly improving distortion by correct use of TRS to RCA plugs and cables, but I have not tested this yet
 
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Lilith

Lilith

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I am going through the exact same test as you present on my UMC204, witch lead me to your thread. Found it was a good opportunity for me to register here and not just lurk around.
I got about the same results as you present, although I have been able to improve results a bit by fiddling with levels. I'll see if I can post a few measurements later, if you are interested. There is info out there about possibly improving distortion by correct use of TRS to RCA plugs and cables, but I have not tested this yet
I was mainly interested in the distortion of the TRS outputs. I don't hear any distortions with sine tones so I guess it musst be better than the measurement (which also includes distortion of the inputs.)
 

Lalaland

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Hi again, sorry I was going to give you a response but whole family been having "fun" with the flu or something like it.
Anyways, I believe what you posted a picture of is mostly distortion on the front inputs - that is to say, the input preamps.
Here are TRS insert measurment that bypass those preamps.

Not perfect, but I don't think output is too bad. Measured at main all the way up (only 717mVrms)
Behringer Umc204HD Distortion.jpg
 
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