R1 and R2 is not a business case at all. It´s all about music listening with variations.
X and XC is as mentioned just having different ´phones where one is closed. TH-900 is not my favorite - and the XC will be my go-to headphone when the house is crowded with activity. :)
Edited by Loevhagen - 11/14/13 at 11:39am