Most of today’s TVs don’t have great sound quality. In fact, many TV manufacturers even recommend buying a sound bar or surround sound system because of it. The good news is that you can buy a decent soundbar for pretty cheap. There’s also no need to deal with an extra component, like an AV receiver, because most of today’s soundbars can plug directly into your TV.
The catch is that most affordable soundbars won’t support high-end immersive sound technologies, such as Dolby Atmos — you’ll probably have to spend at least $400 (but probably more) for a Dolby Atmos soundbar. But if you just want to get better sound out of your TV, 4K or not, you really don’t have to spend much more than $150.
TCL Alto 6+

TCL Alto 6+
The Alto 6+ is an entry-level soundbar and wireless subwoofer that’s designed to work seamlessly with any of TCL’s popular 4K TVs that run Roku’s smart operating system. It connects to your TV via an HDMI ARC connection. It does have built-in Bluetooth, so you can use it to play music from your smartphone when you’re not watching TV. (If you don’t care for the wireless subwoofer and you want to save a little bit of money, you buy the Alto 6 soundbar by itself.)