rumbling

where to start....... I have 4 12" hifonics 300rms on 2 box 2 caps 12v battery 2 amps #1 Insignia 350 or 600 Idk i got it from a friend and he got it from someone and dont know what is is.#2 mtx thunder 502 125W x 2 kinwood KDC-MP45U Pix are added system was tweaked and worked on for the...