I recently made up two pairs of XLR ICs using the recipe on the VH Audio web site. This involves winding 28 ga OCC cotton-wrapped silver around a 1/4" O.D. foamed teflon tube, then wrapping with teflon plumbers tape. I covered this with flexible mesh tubing and terminated with Vampire XLR plugs. Very pleased with the results. More open, transparent and natural sounding than the Tara Lab Air Is that they replaced.
