I have the exact same idea as you (:
but i live in singapore.
for the information you should send and what the email address is,
i think you should check out http://www.dspenter.com for more information.
from what i have heard, sending them the audition is not as effective as going to the company in person to audition.
you need to be asian, but i think they would accept foreigners as well if you are really good.
an easier company to audition for is sm entertainment, as they have an office building in USA, and if i'm not wrong they have weekly auditions. JYP and YG entertainment should have office buildings in USA as well.
there is also the lesser known cube entertainment.
the websites for the other companies -
http://www.smtown.com
http://www.ygfamily.com
http://jype.com
http://cubeent.co.kr
i'm planning to audition for dsp entertainment when i'm older.
if you make it and so do i, i hope to see you there :D