Balanced lines have two advantages.
1) With microphones and high gain inputs, the differential inputs will reject hum and noise picked up by the cables, Common Mode Rejection. This doesn't help us any with cans.
2) With high impedance cans instead of one end of the transducer (coil) going to ground and the other to the audio signal, each transducer lead goes to the same audio, however, each lead is 180 degrees out of phase which causes the peak to peak voltage to be doubled.
So comparing to an amp that doesn't have the necessary voltage swing will have an obvious outcome. Otherwise you have to be very careful to A/B at the exact same volume due to the nonlinear way we hear frequency response. Remember those loudness switches on Hi-Fi gear, they're supposed to compensate for how we hear at lower volumes, I doubt if they are that accurate, so instead, turn it up some
I think the another factor is design...I would think that, in addition to the doubleing of voltage swing [for headphones that need a lot of power] there's also the increase of channels, in that 4 different channels are amped seperatly... which I'm sure leads to less distortion and better sound over all... it just makes sense and sounds better imo
Oh stan... Oh ur very new