I also have a pair of Paradox 1's, blackhole 5 lined cabinet, and upgraded with foil inductors. I have never owned a pair of XLS-enclores so I can't compare. I currently own NX Studio and N3S. IMO, I prefer Paradox 1 to the N3S and find the NX Studio more open-sounding and slightly more refined due to the open tweeter. Paradox 1's are linear and balanced and I enjoy them very much; they are very good with typical box speaker limitations (placement etc.).