Probably not, because trims on modern AVRs have a fairly large step size. There probably needs to be some kind of an analog volume control in line with each of the two paths being compared.
Probably? How are ignorant audiophiles supposed to know how best to tackle this problem? You say there probably has to be some kind of analog volume control in line with each of the two paths being compared? How are audiophiles supposed to know this, and how are they supposed to know how to compensate if such a condition arises? As I said, there is more to this than what is being said. It's not really a straight forward process.
Replace the CD with the test tones with a music CD or a music or video DVD or BD.
Okay, so you listen to music with one amp. Then you spend a few minutes ensuring everything is voltage-matched with a second amp to the same set of speakers. By that stage, everything would sound different because of the time lapse! So then what good is level-matching? Some of you say that audiophiles are ignorant and that they can't fathom how to do it, but it's really NOT a straight forward process. There are things that they need to look out for, things they need to compensate for, and the whole process is somewhat redundant if switching is not quick.
So audiophiles are kinda in a 'damned if you do, damned if you don't' category. If they don't do it, then they're ignorant and/or lazy. Or they don't know how. And if they do do it, their testimony is not entirely legitimate because you can't expect them to trust their own anecdotes minutes apart. Poor audiophile.
I think the main problem is that there is a lack of transparency when discussing these subjects. The subjects are not clearly explained to the layman, so of course they probably won't know how to do it, or know how to do it properly! If someone could do a step by step tutorial, post it on Youtube, it probably would go a LONG way to helping people. Make it easy for people to know how to do it and more people would probably do it!
If many audiophiles haven't done level-matching then one can't assume it's because they're all lazy or incompetent. I think it's because there isn't a clear explanation on how to do it. Some people just assume it's a foregone conclusion that they supposed to know how.