TOPPING firmly believes that Hi-Fi should be united to a high degree with pleasant hearing and excellent performance. That’s why TOPPING has defined an R&D route of parallel hearing experience and parameters since its inception and put the R&D first. We set up the R&D department composed of senior engineers and audiophiles, and invested a lot of money in purchasing professional audio instruments to ensure the performance. In 2016 and 2019, we bought professional audio testers APx555 and APx555B from Audio Precision, which are the best audio testers in the industry today, for R&D and mass production testing, it’s not for nothing that Topping’s products score the highest achievable scores, see audioscience review…