I have paired Hugo with my Mac and ak240 and don't see any difference in sq. is this a gimmick. How will ak240 + Hugo or ak380 + Hugo will be different.
well, when you pair some source (Mac, AK240, AK380,...) to a HUGO, then you hear the HUGO's DAC+AMP sound. So, it is normal that you hear almost no difference between the different sources.
I personally have AK100+HUGO and it is also very good and hear almost no difference with my ARIES+HUGO.
--> The question is instead to compare AK380 alone to AK380+HUGO