Checking out the new DT 700 PRO X and DT 900 PRO X from Beyerdynamic.  Priced at $299, they make up an interesting new tier in the lineup.  We'll talk about choosing between the 700 and 900 as well comparison  versus the 770, 880, 990, Tygr 300 R, and DT 1990 Pro to help you decide  which is the right move.