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This is a measurement of Polk ES20 from Nuyes in dcinside.com: https://gall.dcinside.com/mgallery/board/view/?id=speakers&no=197261 I'm not sure how much are his measurements reliable, though it seems to be valuable. Here's how he measures (Korean)...

There is a measurement for Focal Alpha50 Evo: https://gall.dcinside.com/mgallery/board/view/?id=speakers&no=195953&page=1 He measures speakers in his listening room, but they're still valuable. Here are some other reviews for comparison Genelec 8030c...