Currently driving a 2014 ford fusion with the stock sound system. I've been wanting to upgrade the speakers and might install a sub in the future once I can afford it. I was looking at speakers such as these https://www.crutchfield.com/p_20646CC674/Kicker-46CSC674.html?tp=105 but wasn't sure if my base sound system in my car would be able to work properly with them. Would I need an amplifier or to replace my stereo? And if so any recommendations?