Hi Rufus, that is indeed a very difficult question as I indeed already owned a Totaldac D1 cable, then introduced the Regen and haven't bothered to evaluate them both seperately (I'm kind of lazy that way plus I really 'hate' A-B testing 
) so I can't tell what only the Regen would do or in what exact way they complement each other.
All I can say is that the Regen provided serious improvements (after I switched to a linear PSU feeding the Regen. Thus far I seem to belong to a very small group of Regen users for which the SMPS turned out to become a deal-breaker.) Especially noticable for me in my system are the improvements in low level detail retrievement, clarity and bass reproduction. The differences aren't tiny/hard to notice.
I really think you can't go wrong with the Regen (I myself will never ever let it go again) and even if you don't hear improvements (a loss in SQ so far is very rare and were only connected to the SMPS thus far) I am sure you can resell it without a loss quickly.
) so I can't tell what only the Regen would do or in what exact way they complement each other.All I can say is that the Regen provided serious improvements (after I switched to a linear PSU feeding the Regen. Thus far I seem to belong to a very small group of Regen users for which the SMPS turned out to become a deal-breaker.) Especially noticable for me in my system are the improvements in low level detail retrievement, clarity and bass reproduction. The differences aren't tiny/hard to notice.
I really think you can't go wrong with the Regen (I myself will never ever let it go again) and even if you don't hear improvements (a loss in SQ so far is very rare and were only connected to the SMPS thus far) I am sure you can resell it without a loss quickly.
PS Audio P3, Shunyata ΞTRON Alpha Digital and HC/Furutech power cables, Paul Hynes SR7EHD-MR4, DIY Roon Server & Roon Endpoint running AudioLinux Headless, Phasure Lush^2 USB cable, Audioquest Diamond RJ/E ethernet, Uptone Audio etherREGEN, Mutec MC-3+ USB, Shunyata ΞTRON Anaconda Digital XLR AES/EBU, Devialet Expert 250 Pro CI, Nordost Tyr Reference LS cables, Von Schweikert VR-5 SE Anniversary Edition, Anti-Mode Dual Core 2.0, JL Audio Fathom F112. More detail here.
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The Netherlands
