Is it possible to use this dac without an amp to drive portable headphones? I will use it mainly with my 2.1 system(active speakers), but I also want to use it with my P5 and gr06 from time to time. Any chance it may harm the iems or headphones as it delivers lineout voltage?

I have done a soft mod after reading about the improvement in trebles when you put the pads upside down. It was working indeed, however magnets wouldn't hold the pads. The problem was about foam absorbing sound waves especially in high frequencies. When you put pads upside down foam part doesnt...