I don't know where someone got the idea you can drive these headphones with an iPod or similar device. I couldn't get any decent levels out of my laptop's headphone jack. Had to max out all the bars on the graphic eq to get any kind of volume. Even hooked my DAC to some powered speakers and plugged into the jack on them. Had to set the volume to 3/4 of the way and still it was anemic. I wonder if Audioquest's Dragonfly would drive them. Seeing how it's powered with USB voltage, I'll bet not... Got my HeadRoom Micro back today. Had to replace all the 3.5mm jacks. After 4 years they were cutting in and out. This amp drives them effortlessly so I'm a happy camper!!
Don't know how loudly you listen, but my iPhone drives these to a more than adequate volume at only half of the volume bar.