NASA is 'learning to listen to the X-59' by simulating sonic thumps with fighter jets (photos) 

 Scientists recorded sonic booms created by NASA's F/A-18 and F-15D jets for use in the agency's flight test plan for the X-59 Quesst "quiet" supersonic jet. 

https://cdn.mos.cms.futurecdn.net/79usDyn8ZpbxxtrrXeaLcZ.jpg

https://www.space.com/nasa-x-59-sonic-boom-f-18-recording