21. Since we’re upgrading our head unit, it was only common sense to change out our speakers for something to compliment the new Pioneer in-dash unit. For the front doors, we chose Pioneer’s TS-D1720C 6.75-inch component system. This system features a basalt/aramid composite fiber cone for deep bass without distortion and even comes with a 6x8-inch speaker adapter for late-model Fords for a direct fit. The remote tweeter allowed us to retain the Mach 460 tweeter pod at the top of the door with some minor modification for wire routing.