Five Star Award Winning Design Featuring QED X-Tube Technology XTC utilizes the same technology as Silver Anniversary X-Tube but with the removal of the silver plating and extra wide conductor spacing it aims at a warmer and rounder sound compared to its more expensive sibling. High Performance Low Density Polyethylene Dielectric Cuts down on the amount of audio signal energy lost due to cable capacitance. X-Tube Technology At low frequencies both X-TubeTM and conventional stranded/solid core speaker cables convey signals in a linear way. However, at high frequencies, X-TubeTM retains a near-linear signal transfer, whereas the conventional cable fails to conduct uniformly across the entire conductor area. The result is that X-TubeTM delivers greater fidelity across the audio spectrum which would otherwise be lost in ordinary cables.