hey i have a simple question on crossovers on amps, ive looked everywhere but i've yet to find an answer. i have the Precision Power PPI P900.4 amp, it is fully active capable with bandpass, my question is how do i know my exact crossover points. For example the crossover control when all the way to the left is at 50, and all the way to the right 500 (plus a multiplier of 10 can be used) im trying to band pass my mids around 90 to 3500. do i just take a guess, or is there a way to do this? thank you