This video was taken with SMI SeeSV-S206W to test LG G7 #1 Boombox speaker, which was a commercial as well.
SeeSV-S206W is a real-time sound camera that implements FPGA-based high-speed beamforming technology. It was developed for the detection of highly transient noise sources, and also performs superbly on stationary noise sources. It is capable of capturing 25 images per second. Highly sensitive microphones immediately detect small annoying sounds. Its major application is for the detection of Buzz, Squeak, and Rattle (BSR) noise sources as well as the visualization of Noise, Vibration, and Harshness (NVH) sources.