SPL Test Tones

[grayta 23]

I wasn't sure if I should put this in Music or General Audio.  I think it fits in both so I just stuck it here but please correct me if I am wrong. This is probably a stupid question but... Where can I get a CD or DL anything containing 10Hz-60Hz tones?  I am trying get more into SPL and I wanna start testing different ports.  The reason I want so low is because I have a 20Hz port for fun .  I tried Bass Mekanik but it doesn't go as low and the tones kind of fade in and out (it's weird) and I can't find anything on iTunes.  PLEASE HELP lol.  Thanks!

[crackinhedz 51]

Heres a good site

http://www.realmofexcursion.com/downloads.htm