It takers a highly trained ear to adjust the RTA's
I have 2 1/3 octave RTA's behind each seat... they hook it up to a computer which uses a microphone to analyze the frequency's, which is not always perfect either due to something on the interior resonating, harmonic distortion, etc..
I've been doing a little reading as we speak so I can get the system tuned to the best that I can right now so it does not distort
Their rate is $75/hr from what the guy in the front desk told me, I honestly don't know of any other place locally qualified to tune all of this... I would like it all perfect if possible which is going to take alot of work. I personally do not have $500 to shell out on making my stereo sound top notch, obviously its not a priority right now, but when I do it will be to qualify into audio competitions, and hopefully make my money back.