S9 Pro Plus Martha is certainly not neutral, slightly coloured, and it is a very dynamic sounding dongle dac/amp. Bass has good control and not boosted, the mids are forward, default filter is slightly more forward, on certain track in can be a little shouty when you pump up the volume, but overall it is alright, another point to note is that, IEM pairing is also crucial, pairing a forward sounding IEM with the S9 Pro Plus Martha, or a bright sounding IEM, will definitely spells disaster.
Overall, it is a very dynamic and fun sounding dongle dac amp with plenty of power to spare for most IEMs out there, it can even power efficient headphones without any issue, Hifiman Sundara Closed Back is one of them.
BUY NOW: Hidizs S9 Pro Plus Martha
To view the full video, please click here.