Connecting TV to better external speakers: Type of connection
According to the manual, the AV output section has L and R audio outputs that you could connect to an audio amplifier.





The "Video" connector will be composite video, the L and R audio outputs will be typical phono (AKA RCA) connectors at audio "line" levels.



Twin phono to twin phono cable used for stereo audio (Red is Right channel) and triple phono to triple phono cable used for composite video plus stereo audio (or for some types of component video).

If your speaker/amp has a 3.5mm stereo input you need a cable with ends like this instead:



though you can make up a lead from several combinations.



You will need a normal HiFi amplifier plus passive speakers or active speakers (AKA monitors in audio terminology) which are powered and include a built-in amplifier in one of the speakers - this will have phono or 1/4 jack plug or 3.5mm stereo jack inputs and a volume control.

You can't use USB loudspeakers of the sort often used with PCs.