When you start, make sure everything is installed properly. Make sure everything is in phase. Make sure all eq is set to flat, and soundprocessors off. Make sure all crossovers are off. Burn a cd with a 50hz tone. (
Realm of Excursion) Then disconnect all of your wires leading to your speakers. Get a Digital Volt Meter. Then you have to do some math. Take the output to "ONE" channel of the amp (example, if I have a 50x4 amp, take 50) and then multiply it by how many ohms it will be running. ( Example, if I have a 50x4 (rms) amp that runs at 4ohms, multiply by 4). Then take the square root of that number. That will be the voltage that you will be looking to get from the amp.
Now hook up the+ and - to of the volt meter the corresponding terminals on one channel of the amp. Put the cd in and turn it to 3/4 volume. now slowly raise the gain on the amp until the # you got from the math problem, matches the # on the volt meter. Then set all other speakers in your system that same way.
For crossovers, I always use the crossovers on my h/u. I generally go with 80hz highpass at 18/db octave for front speakers, and 80hz low pass at 24db/octave for subs. DONT turn on the bass boost, or BBE or any of that junk, that just mixes signals and makes it sound worse.
Your system should sound pretty damn good after that.
Kinda odd first post for a "detailing forum"
Amplifier Tuning 
Linear Mode
