These are very good 5.1certifiées THX speakers, the sound is powerful 500W in total, and the connection is complete.
The only fault I have found their, are the (5 fixing screws to secure them to the wall not included) because the U.S standards are almost impossible to find in France. Forced to search for hours on the Net.
So please Mr Logitech, provide the screws with the product especially what cost only a few cents for customers to avoid too much hassle. Or, turn the screw with European standards.