Sorry for the confusion, herbu, Swerd is correct. I was talking about two separate problems.
Diamonds on the Soles of Her Shoes has some rather unusual percussion in it, with considerable complexity going on in the 80-120Hz range, which is right where most people tune the crossover from mains to subs. Though I didn't use this recording to help tune my system, it didn't sound right with the sub engaged until I figured out the best way to integrate my system. (This turned out to be running my mains full-range and using the sub with PEQs to fill in dips below 100Hz.)
I am a big solo piano fan; I have several hundred solo piano CDs. For my favorite works, like the Beethoven piano sonatas, I own multiple versions. To me, it is very annoying to hear piano notes that sound unnaturally loud or soft, so I literally use certain recordings to test my system tuning. I use high-quality headphones to determine what the amplitudes should be independent of the room, and then try to make the in-room response approximate it. Certainly not a perfect process, as it relies on my hearing, but over a period of months with trial and error (lots of error), I got "close enough", and I haven't touched the system since. The octaves below 120Hz have been a particular problem for me, and at audio dealers subs always seemed to make the situation worse, no matter what the sales guy did. Even after I bought my current sub, it took me months to get happy with it.