Basically, any mic that's good, and well-matched to the source.
If the mic sounds like crap, then the RNP isn't going to put any magic fairy dust on it and all of a sudden make it sound good.
And if the mic sounds great, I highly doubt the RNP is going to do anything to wreck the sound. And basically, being a solid but mostly transparent mic pre (comparatively speaking), it's not like it's going to impart some huge sonic stamp of it's own.
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