Not portable, needs a wallwart, if you want portable: http://www.jdslabs.com/item.php?fetchitem=O2Full Anyways, its a modded Fostex T50RP. There GREAT headphones though, wearing them right now. I own that specific O2 too, its a very nice combo.
Yo dude probably sounds weird but would you test your Mad Dogs out with a band like Sublime or Red Hot Chilli Peppers ? They are probably the best representation for the music I will be listening to. They have vocals, guitar and bass in almost every song. I would test them out myself but I dont have any local store that carrys them, thanks.