Amp arrived today, going to install this weekend, manual is pretty good, the one slider switch that has no explanation is the "Config" switch that has 3 settings "LP-BP" , "HP" and "FLAT" assume it is low pass and high pass, but not sure what setting. A little confused because it has 2 knobs for setting LP and HP crossover frequency. Used to play with this stuff all the time when I was much younger, so much has been forgotten. Planning on 4 Ga wire with a 100A fuse on the positive side. Eventually will re run 12 ga speaker wire when speakers arrive. Any tips or suggestions would be appreciated