How to tune my amplifier?

I have had amps tuned by car audio pros and friends who said they knew but didnt know **** ultimately I have found trial and error to be the only way to truly get the sound your wanting but B boost is going to distort at high db levels as well as volume i think youll find the best balence having your volume2/3- 3/4 the way up and bboost between 0-1/4 if your looking for clean b start off at halfway with the low and sub and just adjust slightly with a b test cd on until you hit all of the tones cleanly