Powering speakers

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Some background. So I have what seems like a Vizio soundbar that stopped working one day. Further inspection reveals the pcb board and speakers look okay. I still could not figure why it no longer works. I decided to keep the soundbar since the speakers are still good and replace the pcb board with something else. There are four speakers. Each speak is 4 Ohms, 10 Watts. Two speaker are linked in series which gives me 8 Ohms and 20 Watts if my calculations are correct. Question is how to power them?
 
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