Moode 6 sound quality

[Miss Sissy Princess]

re: expectation bias. 
And what do you say when there is a expectation prior to listening that a change will sound _worse_ but after careful listening the evaluation is that the change improved the sound quality?

Seems to throw a monkey wrench into a blanket statement about expectation bias always discrediting listening  evaluation, no?

No, it does not.  When the brain can't confirm an expected degradation, then it often imagines an improvement -- even when there is no sonic difference whatsoever.

I recommend that you read this article:  http://nwavguy.blogspot.com/2012/04/what-we-hear.html