I am currently building my son a system for his single cab 2000 s10. So far, I have some boston 6.53 for the doors and dash which will be powered by a memphis 16 mc300 amp. His mom bought him a 7201 kenwood amp and a set of kenwood 10" subs which I am not fond of but will use for now. I am running stinger 0ga wire to the back to a fused distribution block and 4 ga to each amp. I am going to use a fuse holder near the battery too. One amp has 2-25 amp fuses and the other has 2-30 amp fuses. Does that mean I will have to use a 110-115 main fuse? As for now until I can grow more money, I am using the factory head unit. I bought a pac oem-2 4-channel line converter to run both amps. What would be the best way to set the gains on the amps with this setup?