Quote:
Yes, your math is basically correct.
But you will need a portable amp that can deliver 1.22 x 2 x 1.414 = 3.45 Volts peak to peak to drive 600 ohm Beyers, so power supply will have to be 4 volts or greater.
Which means your portable headphone amp will probably be running flat out to drive 600 ohm Beyers. However, some of the iBassos output a fair amount of voltage. D6 maybe?
IMHO 80 ohm Beyers would be a better match for a portable amp..
so if i have an Essence stx it will be able to drive them perfectly?
The maximum output level from the line outputs was 2.16V; from the headphone jack, it depended on the setting chosen: 885mV (0dB, for headphones with impedances below 64 ohms), 3.52V (+12dB for headphones with impedances of 64–300 ohms), and 7.03V (+18dB for headphones with impedances of >300 ohms
Taken from http://www.stereophile.com/content/asus-xonar-essence-ststx-soundcards-measurements.
why do people still say that the xonar is too weak to drive the beyers? Or am i misunderstanding something completly here?
Just wondering since im getting my 990/600Ohms and have just bought an stx...dont want to spend another ~300 on an amp :/