The Arietta has enough Volume if your source is strong (DAC-> +/or other source as when a TV is connected to it via a PC (if the channel as a reasonable strong volume)) and if your music is reasonably loud (if you like to listen your music loud as me) it will have the power, not tons but only enough (as the same volume of the PA2V2 driving The DT770pro & DT990 without the distortion of it and obviously with an overall better sound quality).
In my case i have the XMOD as source (it's a USB DAC/DSP card) and it had two outputs. The line out has enough amplification to make the headphones with the amp to sound louder. this output has enough power to drive my DT770 unamped, but only sound louder with louder MP3s and TV channels.
In the other hand is the Headphone out. It make the sound more spacious but artificial and imprecise with my DT770pro, but the output power is the half (well a litlle bit more) than the previous.
The quality of the sound is astonishing with both of my headphones (More with the DT770pro/80 (it give his maximum potential...)), Even you can use a music player to amplify the signal (as XMplay), you will not hear distortion (although is not necessary).
Quote:
Originally Posted by druelle 
Do you think the Arietta would be able to power the 250 ohm DT990s sufficiently?
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