UR22 Frequency Response

[kcs74]

Hi all, just picked up an original Steinberg UR22 and have been testing it with REW. Unfortunately, I have not gotten past the sound card calibration step. The response, as reported by REW, is not in alignment with the specs of the UR22 and has me a little baffled. Has anyone tested a UR22 with REW that can compare these results with their own? Any comments or suggestions would be appreciated.
I am running REW on Mac OS Sierra and tested the UR22 4 different ways with similar but not exact results. I tested with loopbacks setup on Input 1 to Output 1,
Input 2 to Output 2, Input 1 to Headphone Out and Input 2 to Headphone Out. Graphs are below.

 

[John Mulcahy]

What sample rate is set for the UR22 in the Mac's Audio Midi Preferences? Ideally should be the same as REW (so 48k in the case above). It rolls off a little quickly in the plots above, but not drastically so - bear in mind the scale is quite exaggerated for soundcard cal.

 

[kcs74]

Hi John, thanks for the reply. yes, the sample rate is set to 48k in both REW and Audio setup. The HF rolloff sees pretty severe to me considering the specs state a frequency response of less than +/- 0.3 dB from 20-20k. In my graph the -3.0 dB point is at 13k which is way off spec. I'm just worried my unit may be faulty since I picked it up used. It does not resemble any FR graph for the UR22 I have seen. Also, just noticed that REW displays "16 bit" next to the 48k sample rate at bottom of graph window. Shouldn't that be 24 bit?

 

[John Mulcahy]

REW's java driver runs at 16 bit. I tried my UR22 under OS X 10.12.5. I had to update the driver to 1.9.10 and it was a bit temperamental (had to quit and restart REW after changing sample rate) but it was -3 dB at 24 kHz. Are you running Yamaha Steinberg's latest USB driver?

 

[kcs74]

yes, latest driver installed. Just ran a test with signal scope pro and frequency response as well as input/output levels seem to fluctuate. Does not seem normal to me. The two curves were captured about a minute apart.
the green one obviously seems better than the red one. Still not sure whats going on though.

 

[John Mulcahy]

Do you have the Mix knob turned all the way round to DAW? Would have feedback issues if not.

 

[kcs74]

wow, I feel like a complete idiot. Thanks! That resolved the issue.

 

[John Mulcahy]

Great, happy measuring!

 

[steve_rolfeca]

Have fun with your UR22. I have a UR44 in my home office/recording studio, and have been very happy with the performance.

Great preamps...