In my opinion it was a significant upgrade to the digital output. Before the upgrade the sound was less clear, brighter and had a reduced soundstage. Basically it sounded like older digital players. After the upgrade everything improved and now my sonos connect sounds virtually the same as my very good cd transport and currently I listen to the sonos connect more than even my cd transport. I only had the Wyred mod without the upsampling as I use a Metrum NOS DAC which does not upsample so I wanted the signal from the Connect to not be upsampled and be unadulterated.