How to level match when comparing components?

In addition to an SPL meter, you will need a pink noise signal. As Jax2 mentioned, using music to level match is nearly impossible.

I agree it takes time to fully evaluate a single component. For comparisons between two or more, direct A/B is necessary. You can't rely on memory, not even for seconds, because the differences are usually very slight. A selection of least 10 to 12 completely different styles of music and recording techniques is helpful. You might notice something different on one recording, yet nothing noticeable on another.

Then you have the real problem. Which do I *like* better, which *is* better?

Then you have the real problem. Which do I *like* better, which *is* better

I hope you are joking. If those two are different in your mind, then you do have a real problem. If you start trying to please someone else, or second guess some "absolute" or objective then you will never be happy with what you choose. The only thing that should be of concern is what sounds best to you, assuming you are going to be paying for it and living with it and enjoying your music through it. I guess if you are buying as a gift for say, Micheal Fremmer, then you should probably be concerned with what he thinks....otherwise it's up to you.