Would one notice a difference between the older Bifrost and the new "uber"? I am using AKG K702 + Asgard.
Even though I bought my Bifrost with the Uber option, I'm not sure if a human being can hear the difference. The differences in distortion are in the thousandths of a percent. The distortion figures for the basic Bifrost are so far below perception that any improvement is for the benefit of spec sheets and lab equipment. I'm not sure of how many people could tell the difference in noise levels, if so they might have to squeeze so hard as to injure themselves.
Bifrost:
Frequency Response: 20Hz-20KHz, +/-0.1dB, 2Hz-100KHz, -1dB
Maximum Output: 2.0V RMS
THD: <0.005%, 20Hz-20KHz, at max output
IMD: <0.007%, CCIR
S/N: >106dB, referenced to 2V RMS
Bifrost Uber:
Frequency Response: 20Hz-20KHz, +/-0.1dB, 2Hz-100KHz, -1dB
Maximum Output: 2.0V RMS
THD: <0.002%, 20Hz-20KHz, at max output
IMD: <0.002%, CCIR
S/N: >110dB, referenced to 2V RMS