We can compare 13 features from the published specs. The Harman Kardon Enchant 900 is ahead on 5, the Polk Audio MagniFi Mini AX on 2, and 6 are ties. The biggest difference for movies is height: the Harman Kardon Enchant 900 has 2 ceiling-firing channels and the Polk Audio MagniFi Mini AX has none. Only the Polk Audio MagniFi Mini AX comes with a subwoofer, which matters when comparing the prices.