Depends on what you’re trying to do. For setting up speakers the best is the XLO Test CD, using the track with Out of Phase info. "Listen to my voice. It should be coming at you from all around the room." When you get the best non-coherent surround sound effect after experimenting with speaker location as well as room tuning devices from the Out of Phase track you’ll get the best coherent stereo from tracks on CDs that are In Phase, which as fate would have it are not that abundant. May the force be with you. 😳
