Will the speakers still work without the controller? Can I buy a spare controller somewhere if needed?

Also, It seems that the speakers don't work when connected through USB, there is NO system audio. However, when I plugged them into power, I heard the bass and the satellite speakers fire up for a brief second.

EDIT1: I tried unplugging them and plugging them back again. I tried restarting my PC. I do see that the source is there, and they are set as default. But when I switch to them, they don't work. I tried different USB cables, and different ports, but nothing. My only option left is AUX.

I ordered an AUX cable, as I didn't have one, and I have yet to try out that method. Bluetooth also is not working on them. Or is Bluetooth only for the little volume controller that I didn't receive?

Anyways, if I don't find a solution, I am going to return them...