steinberg ur22 mkii

I am new to REW albeit being an audio professional. I was trying to calibrate the interface to squeeze the last drop of precision from UR22 MkII. The hookup is like this: Output: Line Output 1 Input: Input 1 Using ASIO w/24-192 and Standard latency Cabling: TRS from output to XLR input with a...

I just bought a new Steinberg UR22 MkII USB audio and it seem to work. But I ran a loopback measurement and the result had a fuzzy(thick) trace from about 18Khz to 20khz. I did try several sample rates 192k 96k 88k and 48k and they all exhibited a similar response. I have used other converters...