I OWN A 2001 CADILLAC dhs AND HAVE INSTALLED FOURS 12s ALONG WITH A D-CLASS AMP TO THE FACTORY HEAD UNIT, GOING THROUGH THE WIRES FROM THE SUBWOLFER AMP. i NOW WOULD LIKE TO ADD MIDS AND HIGHS T O THE VEHICLE, BUT i HAVE BEEN INFORMED THOAT I SHOULD FIN THE OTHER FACTORY AMP THAT RUNS WITH THE SPEAKERS IN THE DOORS. wHERE IS IT LOCATED. I HAVE A BOLD SYSTEM AND THEY TELL ME THAT THERE ARE 2 AMPS, OF WHICH i CAN ONLY FIND ONE. wHERE ARE THE AMPS LOCATED.