I'm currently looking into upgrading my stereo from a self powered soundbar to a 5.1. I'm not sure whether to buy an amplifier or receiver? My loose understanding is an amplifier would provide power to the speakers whereas a receiver would also support video. My current TV isn't a 4k (and I don't plan on upgrading anytime soon) so I don't think I need a receiver though I still plan on playing the audio from the TV through the speakers. What is my best course of action? Thank you in advance.