You could not splice the wires and just cut a whole for that size thats appropriate and then silicon the hole...I understand it will be bigger, but get the right silicon and all it will look like is the wires coming out of the box with no real visible hole.
yo blaine i did this with my system....it doesnet sound any different...i had to cuz i got my amps in a box and hade em all wired but forgot about the RCA jacks and dident want to life up carpet unscrew 8 screws just to put the rca cables in a lil hole...soo yeeaa you will be fine
my amps are on a piece of wood, in a compartment in my car, you lift the door, you see the amps and the wires. so i want to raise that wood and make all the wires go directly into it, and it is carpeted, so i want small holes...