I am currently in Hong Kong and there is a building that mainly selling portable audio and digital cameras. So I get to try all the amps within the building.
I even tested the Sony WM1Z and Fiio M11 Pro both do have hiss at Ibasso DX160 level. It may be the cable is faulty or 4.4mm cable really not suitable for S8 Freedom
I think that there is a fundamental problem here. Most DAPs optimize their balanced outputs primarily for maximum power output, as well as stero crosstalk etc.Therefore they are massively overpowered for driving sensitive monitors such as the S8 with it's 113db/mw sensitivity rating. First, I would suggest trying out the single-ended outputs for these DAPs as they usually have lower power output and output impedance, meaning less hiss. Or you can try devices with less driving power that may better suit the Fearless S8.
Totally agree. I tried 3.5mm cable connected to Samsung S9+ and the hiss is reduced. Definitely will try again with the unbalanced cable.