test tones

Hey guys,
I'm pretty much done with a sub project I've been working on (haven't heard it yet, will do so tomorow and hopefully post pics). What I need now, are test tones to put it to test and see how deep it goes. The primary thing i'm looking for is CLEAN sub-60 hertz frequencies (I'm not looking for 64kbps stuff-thanks). And if possible, among those, an 18Hz test tone.:)

Stereophile's Test CD3 has a bass decade that starts at 20Hz. Track 17 consists of 1/3 octave warble tones at 20, 31.5, 40, 50, 63, 80, 100, 125, 160 and 200 Hz

thanks, but how am I supposed to get that cd? I am preferably looking for something free, that I can download.

http://forums.audioreview.com/speakers/anyone-got-some-pink-noise-free-17021.html

Florian Posted this one in April, and it is very useful.

Thanks Flo