Warm sounding cables - non fatiguing

I'd suspect the fatigue you are concerned about comes from those products which enhance detail while also inducing an overly bright presentation and/or adding a potential grain and hash along with the enhanced detail.

In addition, those products that round off the edges of initial attack and decay turning what should be a very crisp and clear and otherwise exhilerating dynamic passage into something more monotone/flat and boring are typically more fatiguing that those that do not.

Whatever the case, I'd recommend auditioning the Audience Au24 cable line-up to reduce fatigue in the true sense.

-IMO(of course)

Redkiwi, you've obviously tried 'many' of the 'warmer' cables and since you include Audience (Au24's I assume) cables as one of the many 'warm' cables, perhaps you'd care to share which cables you consider to be 'fast' and 'open' which also 'achieve a timbral balance' for your ears and your system?

-IMO