Has anyone updated Senn HD650 cable?

Yes - I heard a definate improvement. I am using the Headroom Bockhead amp which is a balanced amp, an Ayre preamp, which is also balanced,and therefore, I wanted a balanced XLR connection for the Sennheisers. The improvement was not at all subtle. I am not a fan of Cardas cables, however, Im leaving these cables attached to the phones.

Check over at www.head-fi.org. Lots of information on which aftermarket cables to try. I have both the HD600 and HD650. I tried several cables, but not all. I've found the Cardas has better synergy with HD600, and the Zu Mobius work better with HD650.

FrankC

Joe,

Yes, I've upgraded the 650s with Cardas (10') and there is a definate improvement - most notably in the area of bass depth and delineation. While I haven't heard the other replacement cables (Zu, Equinox, et al), apparently all yield a distinct improvement over the stock cable.

As Frank suggested noted, you may find a lot more info / feed back on this over at HeadFi that will surely help you to decide whether it is worth it or not.

In my opinion, it was very much worth it. My 650s w/ Cardas are paired with a PS Audio GHCA and this is a great match. Power, crystal clear clarity, and quickness - just lovely. YMMV.

Cheers,
Garry