Wow, this thread has really taken off! I only made this suggestion half heartedly on CA a few days ago, but there seemed to be very little interest over there. So I was debating about whether it was worth my efforts to post anything at all on this forum.
I actually attempted to tell Ted all about this discovery several months ago. But when he could not repro this effect in a quick 5 minute test on his system, he didn’t seem even remotely interested in trying any of the variations which I had recommended to make this tweak actually work for him on his system. And unfortunately he declined my invitation to hear this effect for himself on my system several months ago (he’s been over to my house a couple of times previously, so I didn’t think that this was an unreasonable request), so I decided not to post my discoveries over here for a while since I got the distinct impression that I had accidentally ticked him off in some of our emails over this matter. But I guess that since the cat is out of the bag now, so I might as well spill.
FWIW: On my system the difference is truly night and day. The DS’s single worst flaw (an overly narrow soundstage IMO) was completely cured by doing this. We’re talking about a subjective ~4 foot increase in the sound-stage width inside of my system. But I live at the end of my distribution line, and I have poor regulation, and noisy grounds. So I may not be exactly representative here. I’m also not using a regenerator, although I am using what I believe to be a decent power line filter. But in my case isolating the ground took me from being a slightly unhappy DS owner to absolutely LOVING the sound of this DAC for the first time.
I have developed an inexpensive mod which doesn’t involve lifting the ground which has the exact same effect. Actually I have two slight variations on it inside of my head, the second of which I haven’t tried as of yet (but which has the potential to be slightly better). However I’m hesitant to post this info on the web. I’d much rather share this privately rather than to be causing lots of customers to potentially go voiding their warranties, and/or static-zapping their DACs, or possibly (in a worst case scenario) even electrocuting themselves. This forum isn’t exactly DIY Audio, so I have no idea how adept the average user over here is at using a soldering iron, as well as in techniques to keep from accidentally having a damaging static discharges inside of their DACs.
FYI - The problem is NOT one of ground loops, but it is instead one of common-mode noise from the utility ground interfering with the optimal operation of the DS. I will try to elaborate more about my experiences later. But I’d really prefer not to potentially tick-off anyone at PS Audio in the process. So if any of TPTB types on this forum would like to understand more about my theories about what exactly is happening here, and/or vet my mods first, then please contact me and let me know this before I spill the beans entirely. FWIW: I’m an EE, and I am not offering snake oil here. Nor am I trying to sell anyone anything. But I do believe very strongly that taking some minimal efforts at HF ground isolating this unit from your utility ground can really make a difference to its performance on some, of not many, systems.