Personally, I don't understand what you are doing. If you listen to Fleetwood Mac and it didn't sound good, so what if a reference recording does, is that all you are going to listen to from now on at home. The Rumors album isn't that bad of a recording. When I listen to it though I enjoy the sound stage and vocals, some albums just don't use a lot of cymbals. The CD that has been on the most high end systems in my library is Eric Clapton, Slow Hand. This happened pretty much by accident, I had it with me when I started going to high end shops and since I heard it on a lot of good equipment I will throw it in the stack when I go to audition or have something in my system I listen to. This is hardly a reference recording but there are plenty of characteristics of the CD that I know and listen for on other systems. For instance, on a good system you will notice Clapton has a bit of a lisp on All The Way, like he has false teeth in or something. I love how on Wonderful Tonight how the background female singers are distinctly on the far left and a bit to the right of Clapton's voice, I recall how the slide sounds on That Old Frisco. On Rumors a couple things I remember off Rumors and I wish it was the song titles but on one song the guitar in the left speaker just sounds like he is plucking the mess out of it, and on one of the songs you can hear congos that really aren't that noticeable on the radio, the one song is just McVee with a piano. There are many attributes to music or an album that can help you evaluate.

I think it's alright to take a good recording to see what a speaker can do but the best CD's to bring for audition are ones you are most familiar with.

And, listen for a variety of characteristics of the speaker. The frequency response for sure but also how do they do presenting the sound stage, are instruments and voices distinctly separate etc.

When you audition ask the sales person what provisions they have for you to listen in your home. Because when you go to audition you aren't actually hearing one speaker vs another, you are hearing total systems vs other total systems, they just happen to each be using speakers you are interested in.