FWIW, when I was using the SB1 via digital outs I found using a regulated PS made the sound worse. After reading the reports here about bypassing the output IC and using the analog outs, I tried that with my SB2, and later my SB3, and was very impressed. I then tried an inexpensive regulated PS and the sound was improved for sure. I then tried the linear regulated PS people have been recommending here I found the sound was better again but not nearly as big a step as moving away from the SMPS. Exactly why this would be true is not terribly interesting to me. The sound changed in significant ways, mainly in terms that I would associate with a lower noise floor and better current delivery - fine detail resolution is improved and the soundstage is more natural and is better defined and frequency extension is better at both extremes. In a well-set-up and resolving system I would be surprised if the improvement in spaciousness of the soundstage would not be startling - it certainly was for me. But a less resolving system that may be constrained by the practicalities of a stereo system in a living area shared with a significant other may not show much of a difference.
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