In addition to front and rear speakers, for high-quality bass reproduction, it is possible to add a subwoofer to TV.
How To Connect Home Theater Speakers To Your TV
How To Install a HomeTheater Subwoofer
Where do I set the crossover control on my subwoofer's back panel? - Blog, Axiom Audio
RX-V6A Connecting the subwoofer
How to Connect Subwoofer to Receiver without Subwoofer Output
ULTIMA 40 Active: Connect TV (Smart TV) or external subwoofer – Teufel Support EN
How to Connect a Subwoofer to Your Existing Soundbar
DR.J Professional Soundbar with Subwoofer, 2.1 CH Separable Sound Bars for TV, Bluetooth/HDMI-ARC/AUX/Opt 3D Surround Sound
Wohome 2.1ch Small Sound Bars for TV with 6 Levels Voice Enhancement, Built-in Subwoofer, 16 Inches Bluetooth Soundbar Speakers with Optical/AUX/USB Connection, S100 : Electronics
How to Connect a Subwoofer: Low & High Level Connections
How to Connect a Television to a Stereo System