I had a PWD MK.II that I enjoyed trememdously for about 6 months or so. I purchased that unit new from a dealer on Audiogon. I decided to sell it and save up my coins to purchase a Directstream DAC. After a brutal several months of financial wipeout, I realize I can’t afford to purchase a DSD for a long time. Now back to the problem, I purchased a refurbished unit from a reputable dealer and it was shipped directly from PS Audio. I have listened to the DAC for around 6 hours or so and there is something missing. It just doesn’t sound as good as the DAC that I sold using the same equipment. The soundstage isn’t as wide and deep an my original one. Also, the midrange seems a tad bit dry using a tube amp. I upgraded the firmware to the 2.4.6 version and didn’t notice any improvement. I am puzzled, the unit was packed as a new one and was in perfect condition. When I registered the warranty, it seems the unit was originally registered in Oct, 2012. Any suggestions or help would be appreciated.