The Hidizs S9 Pro Plus Martha boasts two dedicated buttons, one for volume up and the other for volume down. In addition, there's another feature that may go unnoticed unless you actively look for it online (Thank you, lack of user manual!). If you simultaneously press both buttons, you can access the filter selection, offering a total of seven filter options.
While I have strong criticisms regarding the build quality of the Hidizs S9 Pro Plus Martha，it compensates with exceptional sound quality. This device provides ample power to drive both my IEMs and headphones while keeping noise and hissing to a minimum, resulting in a clean, distortion-free audio experience. It truly enhances the audio characteristics of my gears, allowing their strengths to shine at their most decent potential possible.
BUY NOW: Hidizs S9 Pro Plus Martha
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