Beginning at the end Plenty of audio reviews praise some flavor-of-the-month product with the threadbare phrase, “these are game changers.” But, trite phraseology or not, that’s what the Spatial Audio M4’s are. After living with them for nearly 6 weeks, they have re-calibrated my expectations for the level of musical pleasure that an audiophile with the … More WORLD PREMIERE REVIEW: The Spatial Hologram M4