I've been waiting for the appropriate thread on which to post a couple of things; this is it (curiously, a thread I started).
1) I got a chuckle out of a sentence on an Australian forum, at the end of a post where the poster enquired about what digital cable to buy. The sentence was:
"Those that believe that digital cables do not affect the sound need not share their theory and knowledge here please."
2) And here was a response on another forum, to the statement that different capacitors have no audible impact on sound:
"Well, this thread is leading us to the big subject of hi fi : where are the limits between consensual scientific knowledge and empirical knowledge? They have to exist together, that's how science progresses. That's also how hifi keeps going on. Implementation, experimentation, etc. It means that we can't measure everything. Tomorrow we'll be able to measure and understand things that are obscure today. Today we can make things that will work better than others, even if we don't know why. Many times we know that something sounds better but we can't fully explain. Hi fi has a lot of this kind of "avangard" situations among lots of "********", I must recognize. Hifi lives in this area and many manufacturers make a profit out of it."