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![Closing echo test waiting window while selecting the microphone joins in listen-only · Issue #9954 · bigbluebutton/bigbluebutton · GitHub Closing echo test waiting window while selecting the microphone joins in listen-only · Issue #9954 · bigbluebutton/bigbluebutton · GitHub](https://user-images.githubusercontent.com/4991088/85951664-5cef9380-b96d-11ea-9946-58f9e048b4ab.gif)
Closing echo test waiting window while selecting the microphone joins in listen-only · Issue #9954 · bigbluebutton/bigbluebutton · GitHub
![Impact echo test configuration showing three air-coupled sensors and... | Download Scientific Diagram Impact echo test configuration showing three air-coupled sensors and... | Download Scientific Diagram](https://www.researchgate.net/publication/277652581/figure/fig3/AS:283846412128258@1444685666797/Impact-echo-test-configuration-showing-three-air-coupled-sensors-and-contact-sensor-above.png)