Gosta - I have spent considerable time (more than the average audiophile) "really listening" to my audio system, due to the many auditions of connectors and cables that I have performed over the last 8 years. So you could say I have "trained my ears" what to listen for.
I have also become acutely familiar of the various nuances of the tone of my system as well as its dynamic and sonic "signature", which can be vastly different from system to system.
The biggest improvement in the Node 2i was in the image, which was already pretty good with the Node 2, but was now larger and had more space around the artists/instruments than the Node 2. The improved details and clarity were also noticeable
But that is in MY system.
Would I hear the same improvements in YOUR system?
- most definitely not, because I am not familiar with its "sound"
So my answer to your question ...
- I DID NOT do an A/B comparison within .5 sec and within .5 db.
MY APPROACH: I have about 60 tracks across multiple genres that I use for auditioning, whose sound I am extremely familiar with (in my system) and when that sound changes (better or worse) I listen more intently to discern what the change is
Hope that helps - Steve