Does a serious factory upgrade, with more muscle at an affordable price, sound too good to be true? What it sounds like are some of the loudest, clearest coaxial ever hidden behind a door on under a back deck. And KICKER takes full responsibility. Give factory sound a serious power injection with a KS680 Coaxial Speaker upgrade. With added improvements on the woofer and tweaked 5tweeter, dropping it in where factory speakers were seems like a no-brainer.