Which Ifi filter product to use?

I'm intrigued by some of the Ifi products and was thinking of making a purchase of either a silencer or a purifier.  I plan on using it between a Sonore UltraRendu and my DAC.  Has anyone experience with their products?  They seem very reasonable.

I have some experience with iFi Audio products, but not with Sonore UltraRendu. What is the power supply used to power the Sonore UltraRendu?  I will start with the power supply.
Anwar:  The PS is from SMall Green Computer and provides about 7 to 7.5V.