I got one that has 47hz...cant remember that site tho...its got a whole list of test tones...mine goes from 45-49hz all in like 10 second bursts...fml whats the site called...
I see a 45hz on ROE, but idk how long it is...and when i get out of class i will try to remember to look at my ipod and see where i got other test tone from because it plays ea one for like 10 secs, worst case senerio u could edit it and make it play the 47hz part 3 times over.