1st question: Yes, not to say that they can't be used with a portable device, I use them every day to listen to music on the couch.But they do require quite a bit more power than many headphones I have tried, like I said, they are designed for a more professional level consumer in mind. 2nd...

These headphones are a good midrange point for those who are looking for a foot in the door with high end audio. These are by no means meant for listening to something like "Moonlight Sonata" in your living room though. These were designed for DJ's, producers, and those that work in a...