Always good reviews on Spatial Audio speakers across the line. Ron's video was good but one thing that makes his comparison to M3's hard, was his gear the same, the room the same, cables the same, and power cords, if not it would be hard to say if the X4 was a better speaker if everything that drives the speakers has been updated or changed from the 1st M3 sapphires reviews. The only way to say would be a/b them within the same system and room in the present setup.