If the protect light keeps on coming home you have them wired to too low of ohms for the amp to handle. They are proably the 4000 series. Use two of the subs and wire one sub to channel 3 and one sub to channel 4 on the 4 channel amp and then use the other two channels for like door speakers or something. Or you could use all three speakers and hook up a speaker to channel 2-3-4 but then you couldnt use it for anything else.