Timrhu, I guess you are suggesting that some tweaks, components, etc. have greater impact than others. I certainly don't deny that given my experiences. I think that DBT advocates typically go further saying that they would have to have differences "proven" to them for some tweaks as they "don't believe anyone can explain why they would make a difference." I would not bother to "prove" anything in audio to another person. I really don't care whether or not they buy the tweak. I do believe that many of these people expect that DBTesting would show few if any differences would be noted in DBTs. If so, how they choose their component baffles me or how they would improve their system would seem impossible.
DBTs seldom, if ever, find humans can hear a difference. It is somewhat complicated but by logic you can never "prove" an hypothesis, but one counter finding can "disprove" an hypothesis. This is why researchers evaluate a null hypothesis, such as Democrats and Republicans vote the same, and then seek enough confidence to reject that hypothesis. But in DBTs the null hypothesis that there are no differences is mainly supported by the research, so they accept the null hypothesis, which cannot logically be done. It is just for this particular study and its measurements and design that anything can be said. Nothing can be generalized.
Magfan, you say, "If, in your own home, you have someone swap / not swap fuses and can not relieably tell the difference, than it makes no difference. period." Absolutely wrong! You hear no difference but others might. Certainly you would concede that a better more revealing system might reveal differences. But you should not buy whatever it is that you are trying. You certainly would or should concede that you may be biased to hearing no difference as others maybe to hearing a difference. I am quite empirical about this thinking you should try it and see. I would paraphrase your sentence to be-If, in your own home, you have someone swap fuses and hear a difference, then there is a difference. Period. Sometimes this swapping may not be easily done double blind, such as removing all room treatments, and sometimes it cannot be made quickly as cables may take hours to settle down.
