Originally Posted by welwynnick
As far as I can tell, ABX always
shows that audio electronics sound the same. So if that's what you've decided beforehand that you want to prove, then ABX testing is the way to do it. And nobody will ever be able to contradict you.
That's certainly not true. There are differences in equipment, as anyone would expect. Even true for cables and interconnects: nobody is saying they are all the same. But what is undeniable is that if they all measure the same, then they ARE all the same and will sound all the same too.
Originally Posted by sdrucker
Hence the question in my first post here - has anyone heard of any instance where an ABX test gave a positive
result with an amplifier?
I can't recall one but it would be very easy to set up a test that ABX-ed a tube amp and a SS amp. The differences between the two are easily measurable and would therefore show up on a test. Note that this does not apply to ALL tube amps and ALL SS amps. It is quite easy to design a SS amp that mimics the sound of a tube amp, for example. And, of course, once one has determined that amp A sounds different to amp B and can reliably be identified as X with far more certainty than chance alone can determine, then one can decide which one is *preferred*. Some may prefer the tube amp, some the SS amp - but the first step has to be to be able to reliably hear a difference.
The problem that the Upgrade Evangelists have is that they deny there is a test in the world can show a difference, and this is how they explain that they cannot reliably hear a difference! They have already decided there MUST be a difference (because someone says there is and charged them a lot of money for it) so if the test doesn't show the difference, then the test must be flawed. It is never that there is not a difference, always the former.
It's why this switch nonsense keeps coming up. It's something they can latch on to to 'prove' the test is flawed.
What do they think the switch is actually doing? They don't know/say.
If you could show them a simple test where one measured the input and output signal of the switch and showed them to be identical, would they still object to the switch? Of course they would!
If you say you will eliminate the switch and swap cables manually, then they have an objection for that too. So the test can never win. It is always wrong if it reveals no differences between the stock unit and the modified unit.