NBS or Transparent interconnects balance

No I haven't but I can tell you that even the lower priced NBS are stunning. I have compared the Mind Serpent (list $350) to the Harmonic Tech top silver and copper and the NBS was considerably better...wider stage & better imaging. The new Monitor series is essentially the same as the old. Walter Fields says the Monitor is more geared to professional studio use.

I've compared The Transparent Reference XL to NBS Master, Professional, and Statement. All three are better than the Transparent. Midrange, bass and detail retrieval are astonishing