Most of my Music Files I have turned into AIFF (CD Quality) Files. Right now I own the Beyerdynamic Custom One Pro's. Love the sound quality from those but was curious if I was missing anything, from lets say the DT990'S or the fairly new 3-D Printed Mr Speakers Mad Dogs I am considering upgrading because just love listening to a great pair of headphones. I am not driving the audio files solely on a portable mp3 device. I have an external Pre Amp I use for listening. Thanks!