I am new to this but having trouble searching for my answer. I use Raspberry PI 3B+ in an arcade cabinet that doubles as a jukebox (so I want better than 2.0 audio). I plugged in some old computer speakers with sub-woofer but all I get is 2.0 audio no sub-woofer. I tried outputting from the PI 3.5mm jack and from HDMI to TV then out to speakers with 3.5mm jack and its louder now from TV but still just 2.0 audio no sub-woofer. I am debating if I could use the PI WiFi for audio to a set a Bluetooth computer speakers with sub-woofer? Now that I write this I guess it is more of a question on the Bluetooth speakers not the PI. Anyways has anyone done this and managed to get 2.1 audio? What speakers did you use?