IM RUNNING 4 12" MEMPHIS SUBS ALL ENCLOSED IN A SEALED BOX EACH SUB IS INDEPENDENT I DONT SEEM TO BE ABLE TO GET THE SUBS TO KICK, I MEAN THEY SOUND GREAT ON THE INSIDE OF MY TRUCK BUT I REALLY DONT HEAR NOTHING ON THE OUTSIDE OR EVEN FILL NOTHING WHAT CAN I DO TO BE ABLE TO MAKE ME BE HEARD...