Vs: FiiO E07K ANDES Review and Help Thread
Hmm... Both PX 100-II and SR325is are 32 ohm and DT 770 pro is 250 ohm. On what position is the gain switch at the rear of the E09k? Pull it down for low impedance and high sensitivity headphones and up for high impedance and low sensivity. I keep it up for my 120 ohm K601 and 150 ohm HD330.
It's set to low already.