Quote Originally Posted by pedrod
to best bring out your bass with EQ try bringing out the frequency of the chromatic pitch of the key you are working in

ie .. If you track is in C try raising the frequency at exactly 32.70Hz or 65.41Hz

These are what top producers call magic frequencies

I dont have a chart at hand, but you will find one if you look around on the net
Theres a chart in the front of a book called Mastering Audio by Bob Katz (which is an amazing book as well)