I have a CD5si, ND5XS and Supernait. All are connected to a Musicline Netszleiste mainsblock with grounding and the sources are connected with standard Naim din cable. The ND5xs is set to floating.
So proper signal grounding here.
Since about 3 months especially the CD5si has a annoying transformer buzzzzzzzzzz/hummm. Now have a ifi DC blocker for the Cd5si. And yes the buzz/humm is reduced very much but i noticed a slight decrease in soundquality.
So if the cd5si only is turned on to play a cd and turned off otherwise (the cd5si comes on song very quick after turned on) no need for the DC blocker. I’m not that technical but it the Cd5si is turned off with the button on the rear is there still optimal signal grounding?
If you are going to use a DC blocker I would use for the SuperNait and everything connected to it… otherwise you are potentially interfering with the ground reference relationship for your nd5XS assuming it’s set float, your SuperNait and when ever you are playing the CDP.