Esoteric RFI/EMI repellants are beginning to appear in various guises in audiophile applications. There's Stillpoint's now declassified but formerly military-secret ERS cloth and the Japanese GC-303 material used by Furutech and Zanden Audio. There's Z-Cable's ERS-derivative Z-Sleeve technology [left] and whatever hi-tech composition is used in HMS' newest Silenzio noise blockers presently taking Europe by storm [right]. There's an unnamed material inside Jerry Ramsey's top-line Audio Magic Eclipse conditioner and the patented FE-Si granules of Shunyata Research's Caelin Gabriel. There's the fact that the chief ingredient of ERS is carbon fiber which makes one suspicious whether, perchance, Carbon fiber shelving properly engineered didn't bestow secondary inter-component shielding benefits besides effective resonance control. Regardless, protection from radio-frequency and electromagnetic interference, as a sign of the times, has become mandatory for high-performance audio. Just think computers, cell and wireless phones, radar detectors. Their operative bandwidths keep going up in frequency as transmitter bands formerly occupied by the m