The noted smartphone camera ranking specialist DxOMark has moved into rating wireless speakers and has now published a couple of charts showing the devices that have impressed the most. Topping the Essential chart is the Amazon Echo Studio speaker while the Advanced chart for more-expensive speakers is headed by the Harman Kardon Citation 200.
https://www.notebookcheck.net/Amazon-Echo-Studio-and-Harman-Kardon-Citation-200-top-DxOMark-s-new-speaker-evaluation-charts.503247.0.html