To add to this - I have a dedicated sound card on my desktop - it lives inside the USB tiny dongle of my gaming headset and makes it emulate surround sound a little bit better. My two tinny tiny speakers are connected to the onboard audio output. Anything I watch, I watch on the TV, or via a bluetooth headset on the phone or tablet. Anything I listen to, I listen to on the phone via aforementioned bluetooth headset, or the nice big non-mobile bluetooth speaker.

I USED to have two powerful and rather higher quality speakers attached to a creative card back in the day when I did all that with the PC though.