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The internal speakers of the iMac 27" 2017 are driven by amplifiers that deliver 6.76 watts into 8 ohms for each speaker component, both the tweeter and the woofer. Therefore, each speaker system (comprising a tweeter and a woofer) can handle approximately 13.52 watts total output power [oai_citation:1,SOLVED: What wattage does this iMac’s speakers use from the motherboard? - iMac Intel 27" EMC 2309 and 2374 - iFixit](https://www.ifixit.com/Answers/View...this+iMac’s+speakers+use+from+the+motherboard). This means the total output for the stereo speakers in the iMac would be around 27-28 watts.