I think what you are describing is the process of using things other than how the gear actually sounds to form an opinion of how it sounds. Once you form your opinion you then look for justification to support your views. Scientifically, this is called the power of assumptions and it is how the human brain functions on a neurological level.
An oversimplified version of your post is that if you prefer blue speakers to red speakers and in a blind test you wouldn't have that visual cue to cloud your perspective. If you think speakers are ugly you are less likely to appreciate their sound.
An oversimplified version of your post is that if you prefer blue speakers to red speakers and in a blind test you wouldn't have that visual cue to cloud your perspective. If you think speakers are ugly you are less likely to appreciate their sound.