iSilencer + uses Active Noise Cancellation II technology. It reduces noise in a similar way to noise-canceling headphones. Uses REBalance technology to eliminate clicks and distortions. Low ESR tantalum capacitors have been added for better filtering of the inputs and outputs. The filter capacity has increased tenfold. In addition to connecting the iSilencer + to an active USB port between your computer and DAC, you can also connect it to unused USB ports. This further reduces the EMI emitted. Every time the number of units (and therefore the number of ANC II circuits) doubles, the noise reduction capability doubles.