At 5:40 there is bit of technical inaccuracy - @LinusTech
The sound bar uses 5 VOLTS (V) not Watts (W)
As you probably now remembered - volts is just the required electricity current to use it, rather than the speaker wattage. As in, 220V is the standard current in the household. The sound bar just converts the 220V AC to 5V DC. Yet I have no idea what is the wattage of the speakers.