Hi, I'm new to the site and the headphone game in general. I really need help with a few questions, please. I own the Oppo PM 3's and yesterday received the Beyerdynamic DT1990 Pro (225 ohm) and Beyerdynamic's A20 amp (amp only- NO DAC)It was a bundle deal I found on Amazon. I had a Chord...

I'm new to the site and I've enjoyed reading the reviews and member comments. I currently own a pair of Oppo PM-3's and the Oppo HA2-SE. To be honest, I'm not crazy about the cans but they do hit the mark for portability, comfort and good sound isolation, both in/out. I've flown many miles...