X Block is a passive filter EMI / RFI, operating on the principle of converting distortions in heat. For example, noise generated in the power supply and digital sections which could have detrimental impacts on the analog chain.
Using X Block is straightforward, simply place it on top of any power supply or digital elements. Placement could also be experimented by the user. You will be surprised at how much noise you can get rid off by such a simple tweak!