MPD3 user here and mine is dead quiet, connected to a Nagra 300i using Cardas Clear series cables.
If you turn it off and then on does the rustling remain? Is it coming from both channels? What source are you feeding to the MPD3? Computer or transport? Does the noise remain with the source turned off? What you are experiencing is not normal nor indicative. Have you checked with Playback Designs? I have never had an issue.
Good luck.
If you turn it off and then on does the rustling remain? Is it coming from both channels? What source are you feeding to the MPD3? Computer or transport? Does the noise remain with the source turned off? What you are experiencing is not normal nor indicative. Have you checked with Playback Designs? I have never had an issue.
Good luck.