BTW this thing beats my LG V10, at least at first impression. Since i no longer have the V10 i can only go by memory but the sound just seems better, and that despite using my HD 600 out of the 3.5mm.
One question about that. Does the 2.5mm output changes the sound quality or is it just about power? I could get balanced cables for the HD 600 and my IEM but honestly if it's just about power i may not need to re-cable since i'm don't really listen to loud music. Plus i think the 3.5mm output doesn't drain the battery as much, right?
Doesn't change sound quality, increases the Voltage. I have 2 units which ab tested at max voltage of the SE. No difference.
For the HD600, I'd use balanced as it gets a little louder. I haven't tested a 300 Ohm to measure exactly how much but it would be at least 4dB.