i have two kicker l5's and they are both 4ohm dual voice coil..i have a 1206d hifonics brutus amp..everything is hooked and i had best buy hook it up..however they wired mi speakers at a 4ohm load..i found out i can have two 4ohm speakers to a 2ohm load..does anyone have a good detailed diagram or explanation?? on each speaker there are two red terminals and two black..one red has a dot and one black has a dot..what are they..