On Thu, 6 Jan 2005 11:04:55 -0000, "Richard Wall"
wrote:

Can anyone point to a Hi-Fi DBT test where no changes were actually made in
the source material to check that the audience could perceive no change ?

That would be EVERY DBT test. Each sample is randomly selected from
the two possibilities - that means that in each test the source has
either changed or not. So false positives and false negatives both
show up as failures, and this is as it should be.

I think the reason you have problems with DBTs is not that they fail,
but that they pretty much always succeed. They succeed in showing that
there is in fact no sonic difference between the components under
test. Again, these days that is as it should be - we have advanced far
enough along the HI Fi road that pretty much all components should
sound the same.

d

Pearce Consulting
http://www.pearce.uk.com