Have you ever noticed that sometimes you're focusing so hard on a minute details that you miss the elephant in the room? Happens to me all the time.
A commenter to these posts mentioned an AB test he witnessed between two amps and after multiple A/B back and forth tests someone suggested the channels between the two amps were reversed. Horrors as not one Golden Ear in the crowd noticed it. While this was anembarrassmentto those in the room as well as the presenters it happens more often than you might think.
We have the amazing ability to filter out everything but what we want to focus on - as humans living in an incredibly noisy environment this feature is a must.
This happens so often to me that I routinely bring someone else into the listening room without telling them what I am focusing on to see if they pick up something stupid like the channels reversed that I missed.
Next time you're evaluating something new in the system take a break and let a day go by before you revisit your decision.
You might see the elephant in the room.