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Although Sonos rep is somewhat correct, they also didn't answer your question. I've seen it peak around 300 with a Kill-A-Watt. Assuming around 50-100 RMS. The amp is built for the speaker, so I would assume a very high efficiency, power controlled by future firmware updates to the internal chipset. It's a well built subwoofer, and it's only competition are component speakers.
Sorry, there was a problem. Please try again later.Due to the convergence of software and hardware in Sonos products we do not share publicly output in watts as it is not an accurate description of the output of the subwoofer.
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