To add do that I'll give you an example. The Home-theater-in-a-box (HTIBs) that they sell at stores from brands like Samsung, Vizio, etc. Their wattage rating is based of off 4ohms, where as standalone speakers are rated based on 8ohms. So 1000W @ 4ohms is technically 500W @ 8ohms. So wattage alone doesn't help to know how good the speakers are.
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