You'll need a few songs, if music is what you want to tune with.
I use a song that produces distortion to speakers easily to set my crossover frequencies. "Phatty Girl" as well as Lil Jon's "Bia Bia" is good for that. Then I use a loud female song, recently it's been J-Lo, but before it was Jewel to make sure the speakers aren't set to be too SHRILL. Then I find a rock song, to test the channel seperation(which is what I call it anyways). I use Rob Zombie "Dragula" for that. The final piece is to set up the sub level, if you like musical subs and not just loud. A good slow song will do that nicely, I use Staind "Been awhile" and Eric Clapton "Change the World." The bass starts out as an annoying hum thru the song, so I turn the sub level down until it blends in.
Just my 2 cents.//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif