Eight-unit headphones are composed of eight speaker units in this pair of headphones, and there are four speaker units in each earphone to make sound. 8sh is the HIFI version of the eight-unit male model, and qdc distinguishes the tuning version by the last letter. This product will be launched around 16. Apart from Gemini, among the other three eight-unit models, 8sh seems to be the most popular among enthusiasts and the most discussed one on the Internet.