Fluance Ri71 Reference Stereo Powered Bookshelf Speakers with High Performance AMT Tweeters, 5" Drivers, 120W Amplifier for Music, Turntable, TV, PC - HDMI, Bluetooth, RCA & Subwoofer Out (Black Ash)

Sure, for a $0 start-up cost, connecting your existing Rockville AMP6 to your TV via an RCA cable will likely be better than the majority of soundbars out there. If you did want to spend up to $500 and have zero plans for expandability into surround sound, I would still probably recommend a pair of powered speakers over passive speakers and a separate amp. Something like the Fluance Ri71 connected to your TV via HDMI ARC: https://www.amazon.com/Fluance-Reference-Bookshelf-Performance-Amplifier/dp/B0D9C2MMNX?th=1 Or the Kanto REN: https://www.amazon.com/Kanto-Powered-Speaker-Theater-Bluetooth/dp/B0DJPNCF7Y?th=1