Thank you for all of the replies! Upon further investigation, the pop does not seem to happen on all DSD recordings, but on the ones with it, converting to PCM still has the same result (static-like pop).
Is this a file issue? As Kal suggested?
Ok, I think there must be an issue with the program I was using for iso => dsf conversion. I was using ‘XRECODE’ (as it seems pretty fast), whereas in the past I had used Sonore Iso2DSD. I never had problems with the latter and, indeed, having tried converting a problematic iso, it worked fine having gone through Iso2DSD. Any ideas why this may be happening? XRECODE seems quite versatile, but perhaps no so much for DSD?
I’ve never used XRECODE for ISO-to-dsf conversion although I use it for lots of other functions.
ISO2DSD, otoh, is not a conversion program. It is a GUI or interface for programs that do the work, in this case, sacd_extract. There have been many versions of the original and also at least two divergent variants of it. The early versions of the original suffered from the fault of adding end-of-track clicks but the most recent versions do not. ISO2DSD, itself, has not changed.