stereo in 1999 silverado

there are seperate wires going to the tweeter and midbass speaker in the front doors on this year, does anyone know where the x-over is, or if there is one at all? seems to me there would have to be one somewhere to run components like that. thanks in advance

-nick
1999 4.8 xcab, black, with salt stain accents
damn mn winter

the tweeter has a bass blocker circuit built in, i think, their is no actual crossover in the wiring