"That said, no one runs SPDIF that far - the implementation at both ends would have to be near perfect.
Once you get into the fact that there is tremendous variation in the sound of SPDIF cables (is it the cable? does one cable do a better job overcoming problems at one end or both? no one knows) My point is simply that most of us could not afford a "name" 15'. And there is no compelling reason to run one to connect a computer rig to a DAC."
Ckorody-
I run a 5 meter Analogresearch-Technology Ubyte cable (BNC on both ends) between my Duet receiver with Analogresearch-Technology's Duetta upgrade and my digital processor. See the link below for the "compelling reason."
http://www.analogresearch-technology.net/ubyte.html
BTW- I don't know what you consider to be a "name" 15' cable,
but a 5 meter Audience Conductor SPDIF(RCAs) cable retails for $192., $228. with BNCs.