Does Gryphon Diablo 300 Benefit With A Costly Mains Power Cable?

Not familiar with that amp but I am familiar with DPS-4.1 and Shunyata. DPS has crystalline clarity and can sound either very good and pleasant or slightly artificial depending on your system. Shunyata is a brighter sounding cable. I didn’t like their Alpha X power and USB cables. Definitely worth trying though as you never know how a power cable will interact with your system. 

Thanks. May I ask which Shunyata mains power cable which you like? The Alpha-X is at the top of my budget as the Sigma-X and above are too much money. I am looking at a brighter and more open and dynamic sound but don’t want to lose the great bass, fluidity and tonality of the DPS4.1. I guess there is no other way than to try it in the system. 

I could get another DPS4.1 instead of the costlier Alpha-X NR though.

I tested Alpha X v2. What sonic characteristics are you looking for and what current characteristics you are trying to improve?

No experience with the Gryphon Diablo 300.  However, one thing I do know is, with any amp or other components, trail and error is the key to finding the perfect power cable for that particular component.  Happy listening.