Topic: Behringer UMC202HD

I was interested in the latency of the cheaper competitor and did a roundtrip-test via a physical loopback cable. Result at the beginning, the raw data at the end.

Output latency [1], tested with jack_iodelay at r=44100 Hz, p=64, n=2
Focusrite 2i2 gen2, 6.3 ms (ASYNC), 5.0 ms (SYNC)
Behringer UMC202HD, 7.7 ms (ASYNC), 6.3 ms (SYNC)

[1] Contains one assumption from the man page:
"Then,  if  you  believe that  the  latency  is equally distributed between the input and output parts of your audio hardware (extremely likely), divide the result  by two  and  use that for input and output latency values."

Details
-------

UMC202HD (ASYNC):
   488.684 frames     11.081 ms total roundtrip latency
        extra loopback latency: 296 frames
        use 148 for the backend arguments -I and -O

 2636 ?        SLl    0:16 /usr/bin/qjackctl
 2646 ?        SLsl   6:43 /usr/bin/jackd -p128 -dalsa -r44100 -p64 -n2 -D -Chw:U192k,0 -Phw:U192k,0 -i2 -o2
 2707 ?        SLl    3:21 jack_iodelay

Normal ASYNC playback: (n+1)*p -> 3*64=192 frames + 148 frames "extra loopback latency" = 340 frames -> 7.7 ms
-------------------------------------------------------

UMC202HD (SYNC):
   430.684 frames      9.766 ms total roundtrip latency
        extra loopback latency: 302 frames
        use 151 for the backend arguments -I and -O

 2944 ?        SLl    0:02 /usr/bin/qjackctl
 2949 ?        SLsl   0:15 /usr/bin/jackd -S -p128 -dalsa -r44100 -p64 -n2 -D -Chw:U192k,0 -Phw:U192k,0 -i2 -o2
 2964 pts/0    SLl    0:06 jack_iodelay

SYNC playback: n*p -> 2*64=128 frames + 151 frames "extra loopback latency" = 279 frames -> 6.3 ms
-------------------------------------------------------

2i2 gen2 (ASYNC):
   366.715 frames      8.316 ms total roundtrip latency
        extra loopback latency: 174 frames
        use 87 for the backend arguments -I and -

 2997 ?        SLl    0:01 /usr/bin/qjackctl
 3002 ?        SLsl   0:10 /usr/bin/jackd -p128 -dalsa -r44100 -p64 -n2 -D -Chw:USB -Phw:USB -i2 -o2
 3011 pts/0    SLl+   0:04 jack_iodelay

Normal ASYNC playback: (n+1)*p -> 3*64=192 frames + 87 frames "extra loopback latency" = 279 frames -> 6.3 ms
-------------------------------------------------------

2i2 gen2 (SYNC):
   312.715 frames      7.091 ms total roundtrip latency
        extra loopback latency: 184 frames
        use 92 for the backend arguments -I and -O

 3035 ?        SLl    0:01 /usr/bin/qjackctl
 3041 ?        SLsl   0:05 /usr/bin/jackd -S -p128 -dalsa -r44100 -p64 -n2 -D -Chw:USB -Phw:USB -i2 -o2
 3050 pts/0    SLl+   0:02 jack_iodelay

SYNC playback: n*p -> 2*64=128 frames + 92 frames "extra loopback latency" = 220 frames -> 5.0 ms
-------------------------------------------------------
Last edited by groovy (16-12-2020 23:22)

Re: Behringer UMC202HD

Well conceived and executed groovy.

I like the Focusrite Scarlett 2i2 also for the stereo & mono output monitoring (as far as I can tell, the Behringer UMC202HD only has a mono).

Pianoteq Studio Bundle (Pro plus all instruments)  - Kawai MP11 digital piano - Yamaha HS8 monitors

Re: Behringer UMC202HD

Thank you, Qexl.
But why do you think, they would have MONO monitoring?

Re: Behringer UMC202HD

If using direct monitoring (for zero latency), the Behringer UMC202HD signal is in mono.

Whereas the Focusrite Scarlett 2i2 has a stereo/mono switch for direct monitoring.

What's possibly confusing, is 'direct monitoring' is sending signal straight out to speakers, avoiding the return path with its latency to the PC.

If someone really wants to shave off even more latency by using direct monitoring, if choosing between these 2 units, the Focusrite Scarlett 2i2 does that with a choice of stereo or mono, making it even better than just being a ms faster in normal 'to PC' setups


Here's some linkages..



"Excellent for the price, be aware of the limitiations"

user review on Amazon wrote:

One little thing took some getting used to--"direct monitor" blends the left and right signals into a mono output which is sent to phone jack and RCA outputs, though of course the stereo separation is maintained in the signals sent to and from the computer over the USB"

https://www.amazon.ca/gp/customer-revie...B00QHURUBE



"Excellent Budget USB Interface/DAC for price - also UMC202HD" (user review on Amazon)

user review on Amazon wrote:

On the UMC202HD you do lose the consumer friendly feature of mono to stereo direct listening however. For some reason, but which makes the value proposition for the UM2 all the greater, it is wired so that each channel automatically feeds stereo out on the direct monitor headphone output, meaning you will hear sound on both sides of the drums. Unfortunately, the UMC202HD only supports mono to mono channel direct monitoring, meaning each channel input only drives one output channel (left or right) on your monitor or headphones. Maybe this is fine if you actually use a single mono speaker for review which also makes sense. In this way, the UMC202HD is more geared towards professional users which means more equipment and setup the further up in professional equipment you go.

https://www.amazon.com/-/es/gp/customer...B00EK1OTZC



"Behringer UMC202HD Review: The Ideal Budget Interface?"

MusicProductionReviewer.com wrote:

Disadvantages

    Direct monitoring only in mono.

https://musicproductionreviewer.com/rev...hd-review/



To give Behringer a positive point, what I do like about it is the Midas pre-amp. I've known of their consoles for a time - so would be interested to know more about that aspect of this unit. It could be nicer than the Scarlett on that point (but haven't tried either). But if zero latency direct monitoring was not important, to me, maybe the Midas pre-amp would win it for the Behringer

Pianoteq Studio Bundle (Pro plus all instruments)  - Kawai MP11 digital piano - Yamaha HS8 monitors

Re: Behringer UMC202HD

Hi,
none of the both devices has an explicit MONO switch, therefore my question.
But now I understand, what you mean, after I made a test with two laptops and a testsignal from Audacity (L=440Hz R=1000Hz).

The UMC202HD does anything as expected and intuitive. Both channels stay always clear separated in the digital and analog domain. No MONO downmix nowhere.

The 2i2 gen2 surprises with an obscure feature in the analog domain. With DIRECT MONITOR ON both (analog) input channels are summed to mono and then splitted for the headphones (L/R). - Hopefully this is carried out with active electronics and not just passively with resistors.

Personally I prefer a clean design with true independent channels.

The sound-quality of a 2i2 is very good in my opinion and it has a good headphone amp with low impedance (this is very important for "percussive" sounds like piano IMHO). Afaik I measured the impedance in another PTQ thread.

The analog sound of the UMC202HD I have not checked so far. Their cheap mixer consoles I never liked in the past, always sounded dead/blurred to my ears, as if they do something systematically wrong at Behringer. More likely: My perception is the systematic error ;-)

PS: "zero latency" is buzzwording, analog audio chains are having this wonderful "feature" per se and for free.

Last edited by groovy (17-12-2020 22:10)

Re: Behringer UMC202HD

Thanks groovy! - wow curious - devil's always in the details. Seems both units have something unusual to consider if direct monitoring (stereo speakers & headphones) is valuable to the decision.

The sound of these 2 should be still very good - (aware some readers might not differentiate between normal uses in PC and DAW and direct monitoring mode which may only affect some).

groovy wrote:

The 2i2 gen2 surprises with an obscure feature in the analog domain. With DIRECT MONITOR ON both (analog) input channels are summed to mono and then splitted for the headphones (L/R).

Interesting - I can understand (but only to an extent in the digital era) that direct monitoring to earphones is still handled cheaply.

Wonder how much per unit is actually saved in manufacturing this range of devices tho - at least compared to the old actually big physical resources - channels/valves & lifetime of replacements/circuits/faders - physical and actually expensive old days stuff.

Maybe there's a costly patent still out there for 'method of sending a stereo mix in direct monitoring mode' XD

groovy wrote:

none of the both devices has an explicit MONO switch

On the Focusrite front face, I saw the direct monitor button seems to toggle between mono and stereo.. linked a pic of it in case it's not on the unit you have? Cheers groovy!

Image of Focusrite Scarlett 2i2 front panel

Pianoteq Studio Bundle (Pro plus all instruments)  - Kawai MP11 digital piano - Yamaha HS8 monitors

Re: Behringer UMC202HD

Your pic is a 2i2 gen3. My gen2 and gen1 are having a DIRECT MONITOR switch just labeled with OFF/ON. The Behringer not even has an OFF/ON indication.

It is good Focusrite changed the symbols, so its special function gets clearer (channel 1 and 2 are mixed and distributed to L and R of the Headphone out AND the Line out).

DIRECT MONITOR in my tested Behringer and Focusrite is just another wording for routing the analog input analogically to the headphone out and the line out at the same time.

The Behringer does not mix those channels on this path, while the Focusrite additionally mixes and splits both input channels so that L and R have the same signal ("stereo").

I have to say I'm using those Audiointerfaces just as DigitalAnalogConverter and Headphone-amp for outputting Pianoteq :-)

Cheers Qexl!

Last edited by groovy (18-12-2020 08:40)

Re: Behringer UMC202HD

Hey thanks groovy!

Thought I was looking at gen 2 there - explains my confusion. Thanks so much for this interesting food for thought

Pianoteq Studio Bundle (Pro plus all instruments)  - Kawai MP11 digital piano - Yamaha HS8 monitors

Re: Behringer UMC202HD

It seems not just the latency is more or less cloned. Another relevant spec for headphone players can be the output impedance. I forgot, what I measured in the past, so I repeated it today.

I found ~10 Ohm for both, UMC202HD and 2i2gen2.

Not bad, I had expected around 47 Ohm that I found in a Behringer mixer in the past.

PS:
@400 Hz, 1 V, Load resistance 92.9 Ohm

Re: Behringer UMC202HD

Modern devices can mostly be expected to have a low output impedance. IIRC my iPad (or perhaps it's my Samsung Galaxy) is specified to have a 7Ω output impedance, and I'd expect to discover that was due to a couple of 6.8Ω surface mount resistors if I could look inside. Amplification in these devices is now universally by operational amplifier Integrated Circuits (or digital Pulse Width Modulated output devices), which have virtually zero internal output impedance. Output series resistance is put in place for over-current protection in case of a short circuit, so the device will not be damaged if the headphone output is shorted out.

Since these devices run on modest voltage supplies internally, the resistance only needs to be small. More professional type gear like mixers can provide higher output voltage to headphones, so typically a higher output series resistance will both provide the desirable short circuit protection, and also attenuate the output level to the headphones, to stop the listener from accidentally blowing their ears up, or damaging headphones (or vice-versa).

It might be worth mentioning that output impedance can also influence the character of headphone sound, both from the point of view of frequency response and damping.

Headphones can be designed with either low or high impedance sources in mind, but it's not often specified which design philosophy has been followed. You may see, for example, studio monitoring 'phones specified as something like: Designed for source impedance 120Ω - 250Ω

Classic studio headphones are the most likely to have been designed to work with high output impedance devices, since historically the headphone outputs from power amplifiers and mixing desks incorporated these sort of values of series resistance. This amount of resistance will interact with the reactance (inductance and capacitance) of headphones, resulting in frequency response variations, and provide no effective damping to control unwanted diaphragm movements. So this style of 'phone will be well damped mechanically and will have been designed to have the desired frequency response when driven from the appropriate source resistance. A few people may have been underwhelmed listening to highly recommended studio monitoring headphones on a modern mobile device, where very low output impedance can over-damp the drivers and deliver a sound that might be described as lacking in energy or a bit dull. Whereas driven from a more suitable device they would come alive.

Conversely, most modern headphone designs would have been developed to work with these low impedance devices, and if plugged into an old school mixing console could end up with a lumpy frequency response and poor imaging from undamped resonances and phase anomalies (assuming the 'phones are good enough to let you hear those differences).

Re: Behringer UMC202HD

Nice info, thanks Platypus! Thanks.

Even on my digital devices, altering input thru to output volumes can still result in old-world analog "hot" or "pallid" signal.

Pianoteq Studio Bundle (Pro plus all instruments)  - Kawai MP11 digital piano - Yamaha HS8 monitors

Re: Behringer UMC202HD

It also pops into my mind to mention, prompted by reference to a 2i2 interface, that my own 2i4 at about 6 months beyond warranty developed tendencies to click and pop regardless of what it was connected to. Delving inside revealed it is packed with cheap and nasty brands of electrolytic capacitors, but I don't intend to trawl through replacing them all to see if that is the cause of its malaise. I just hope Yamaha did a better job with the Steinberg UR242 I now use.

Re: Behringer UMC202HD

Thanks, Platypus, very apropos for me now as I just purchased a new set of headphones and feel that they are different enough that I don't know if I like them!

I drive my powered monitor speakers and my headphones with a Steinberg ur-22 mkII, and just got the new Emotiva GR-1 graphene vapor-deposited membrane headphones, to replace my Beyerdynamics 880 set.  Both are 32 ohm rated, but I run the 880 at full volume off the ur-22, but have to dial back about 40% to match the volume levels when listening to the GR-1.  And the 880 seems more open, as with them there's more of the "am I hearing headphones or speakers?" sensation, though the bass is better with the Emotiva GR-1.

All in all, definitely 'a first world problem.'

- David

Re: Behringer UMC202HD

Apropos off-topic, I'm actually using a Beyerdynamic DT880 Edition (32 Ohm).

dklein wrote:

"am I hearing headphones or speakers?" sensation

hehe, I know that effect with this cans too :-)

But the headphone out of the Steinberg ur-22 mkII must be pretty weak, when you run your "880 at full volume", interesting.

I don't run them more than 1/3 fullscale on my 2i2 gen2.

The bass sounds neutral with my setup, what I like. But I guess I know, what you mean.

Re: Behringer UMC202HD

Neither are provided with very clear specifications regarding Sensitivity - for the DT880, Beyerdynamic state 96dB sensitivity without any qualification.

The GR1s are credited with Efficiency of 106 dB, also without any qualification.

Sensitivity and Efficiency are not exactly the same thing, but if perchance the two terms are being used to describe the result of the same test conditions, that would lead us to expect a higher sound level from the GR1 on the same input signal.

Re: Behringer UMC202HD

Thanks, Platypus.  Indeed such seems the case volume-wise.  What I can't understand is whether I have such greater preference for the transparent openness of the DT880 pair, a disdain for the increased detail of the GR-1 (which may be partly volume-driven, even though I keep ratcheting it down), or whether the GR-1 pair have a coloration that I don't like (which may also be artifactual, influenced by the partially-open versus open nature).

- David

Re: Behringer UMC202HD

Platypus wrote:

Neither are provided with very clear specifications regarding Sensitivity - for the DT880, Beyerdynamic state 96dB sensitivity without any qualification.

Beyerdynamic qualifies it in the datasheet:

Nominal SPL ... 96 dB
(all specifications according to EN 60 268-7)

This is a clear, but only implicit specification. "EN 60 268-7" is an international standard, but I can't find this text at the moment (and payware probably).

But I'm quite sure this modern standard is the SPL at 1 kHz and 1 mW.

@dklein
Because of the weak level of the Steinberg, I am not sure, if it has a real (active electronics) headphone amp inside at all. Are you sure the headphone out is not just the Line out tapped with resistors? Could be an explanation, why your GR-1 sounds less "open" and bassier, because the volume pot has another level (40% vs. 100%) and this implicates a higher output impedance when carried out just with resistors. Just an idea ...

Last edited by groovy (21-12-2020 15:16)

Re: Behringer UMC202HD

thank you, groovy. I will try the headphones on another source, both of them. Perhaps the openness is my interpretation of the amount of ambient sound that gets in when I wear the byerdynamics DT880 versus the emotiva GR-1 set (the byerdynamics are notably more transparent to outside ambient sounds.

- David

Re: Behringer UMC202HD

Thanks groovy, I hadn't seen that tiny footnote text about the Standard.

Quoting the same figure for all 3 impedances certainly would cause us to suspect it's wattage input, which is efficiency as per Emotiva's specs. And another search on that basis finds someone with a test report confirming that:

"The sensitivity of the Beyerdynamic DT 880 Pro headphones is 101.53 dB/V SPL by the voltage and 95.56 dB/mW SPL by the power. The sensitivity by voltage reflects the relative "loudness" of the headphones among others - the higher is the value, the louder are the headphones."

https://reference-audio-analyzer.pro/en...#gsc.tab=0

So the GR1s are claiming 10dB higher SPL if they also are measuring 1mW input.

Re: Behringer UMC202HD

The GR1s might also need a lot of burn-in to open up their sound. A pair of Sennheisers I've used certainly did.

Re: Behringer UMC202HD

Thanks again.  I won't give up on them yet.  :-)

- David