artatgray
100+ Head-Fier
No one is saying it's not possible to power them with 0.55vrms. It'll lack authority which you need to hear for yourself.
Another mistake you've made is only looking at the required voltage part of the calculation. By the way, both of my portable DAC-AMP dongles are capable of far higher voltages.
While voltage is essential, the more important things here are milliwatts and amperage. My portables aren't lacking in that regard, either.
Even a 0.5 dB difference in volume between amplifiers is enough to cause one to percieve the louder as being of a "higher quality". Human hearing is tricky that way.
However, if we examine the louder in the lab, we might find that it produces higher distortion, weaker channel separation, poorer dynamic range, more noise, etc..
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