*Newbie here*. I have a new 2020 Bighorn Crewcab with the basic speaker system (not Alpine). Crutchfield says using 4 ohm speakers in place of what's there would not be ideal since the factory's is lower ohms. They suggest an after market amp and all the BS that goes along with it. I hate to start tearing stuff apart in a brand new truck. Has anyone just simply changed out their speakers one for one with no amp or DSR1? What were your end results?