The G109-P definitely isn't underpowered for a DT770 600 Ohm. By Far.
But how about the g103-p tho? that's the one im aiming at. Will it have a neutral sound too? like supposedly the g109-p has. Someone said that the g109-p has a neutral sound compared to the Schiitt ones.
Also will the g103-p be underpowered for a DT770 600 ohm in default jumper status? I was worried that if I didn't change the jumper I wouldn't get the best of it.
I have looked at your picture and I don't really get it. I thought it was going to be just a single jumper with 3 low med high settings and high was for 600 ohm+ lol