Just wanted to share my enthusiasm at discovering the Black Dragon Version 2 replacement cable for my Sennheiser HD650. I've always liked the warmth of the HD650 but felt it lacks heft and impact. I was using the Cardas cable with it and I felt that enhanced the midrange some and conveyed more detail. On the other hand, the Black Dragon really improves the low-end extension and grip and the imaging is fantastic. Reminds me of the HD800 (which I don't own but have heard at meets).
My other equipment is a Windows 7 laptop driving a Matrix Audio X-Sabre DAC, and a Little Dot Mk IV SE.