Not sure, but I think it raises the output performance (but only) in balanced mode. ((≥24mW（300Ω / THD+N＜1%，balanced turbo off) ≥77mW（300Ω / THD+N＜1%，balanced turbo on) ((ps. According to the laws of physics this accumulator time ... I think, can reduce it. )) I have Q5 and this is more than 7mW (I have AM3B ≥70mW（300Ω / THD+N＜1% in balanced ) That's a lot of HD650 and even bigger (600ohm) Much stronger was the amplifier than the X3iii. The tone should be similar to the X3iii, since AKM4990 is there. If you have an android phone, you can try to use it with USB as DAC / bAMP (by this UAPP / Hiby / FiiO music). I'm interested in whether it works (iOS so well) or someone who has tried it with a droid.