Listening to your guqin using stethoscope while playing it

Is your guqin too soft? *smile*

Have you ever tried listening to your guqin using a stethoscope while playing it, especially in a very noisy environment like an exhibition hall? Seems that these people in the photos are very clever indeed! They're on to a very good idea! ^_^ 

Source of photos: http://shop34407406.taobao.com/?spm=2013.1.w1277623-2373602292.2.lXsznO