I read that your amp has 3 selectable output impedances ranging from 0.1 to 120 Ohms. Even the maximum setting of 120 Ohms is not very significant compared to the T1's 600 Ohm impedance, so you may not perceive much difference. To a lower impedance headphone, the 120 Ohm output impedance is more significant so you can expect more difference in sound.
I see. One reason I am curious about this is I just not sure if the T1 can be fully driven by the Ember since the impedance is kind of high.