They are both running in SE or Balanced mode. The only difference is that balanced is a different connector with the extra gain phases for each channel instead of them being combined in one amp. I already emailed topping about using both or one DAC depending on the mode. What are you using to feed the DX7? Also on another note I took my DX7 to a meet and used it to power balanced HD800 and HE-6 and it did wonderfully! Honestly its only downside is the 10ohm output impedance which can affect some headphones with the 1/8 or 1/10 rule!