Re: Vintage Rails parallel vs Cool Rails: What's the difference???
I've heard quite a bit of difference. The old housing VRn, which I had, was internally wired in parallel. Plenty chime, bright, very clear top end, a bit thin over all. Cool Rails were much warmer and fatter, getting into vintage humbucker-esque territory.
Granted, I haven't heard the VRn in series, but simply going by the resistances listed on the SD website, a CRn in series still appears to have a few more wraps than a VRn (calculated from listed resistance with coils in parallel... not sure what the appropriate margin of error is). A few more wraps and a different pole piece architecture, I would wager there's enough to be heard. Guess I would have to hear the VRn in series to really know.