Quote Originally Posted by roclite View Post
Hi all,

I have been following this thread with interest and hope i can contribute something to the discussion.
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roclite
Yes indeed, roclite,

You comments are very interesting indeed, and welcome to AR Forums.

My original recommendation for the SD-1955 was for S/PDIF only, specifically coaxial connection. I found the USB connection unsatisfactory.

I have documented my opamp substitutions above in this thread. The smoothest had dual OPA627's in the I/V stage; (or they were from China so maybe they were counterfeit, but they work pretty well).

I always used the power supply that originally came with the SD-1955 that is a SMPS, so I have no experience with linear supplies. There is a school of thought that SMPS are actually better with DACs of the modestly price variety, but I don't recall the explanation which beyond my limited technical understanding.