[PAS055]

I have a BMW E92 320d with sat nav, i'm 99.9% sure that my sat nav (built in monitor and head unit) are business. I have UK business road maps cd. I have a oem audio system which includes total of 4 speakers and 2 subs under seats. I upgraded the system by a MTX amplifier which i didn't needed to cut any factory wire, 2, 4 inch speakers with tweeters MTX in front doors with MTX tweeters in the oem tweeter pod and the same in rear panels. It came very powerfull as we needed to put in 2 crossovers but i have the subwoofers getting signal from the front doors speakers and i need something to control frequencys for the subs and mid ranges and tweeters. i tought i can put any crossovers with a setting or at least can someone tell me what he've done if he made this system. I need to control mid range and tweeters to still get clear sound and a deep bass note. thanks alot. what is there diferrent from proffesional to business sat nav? and is the wiring harness the same please?