= The QED Reference XT400 Speaker Cable has been recognized for its exceptional performance with the prestigious What Hi Fi? Best Speaker Cable Award solidifying its reputation as a top choice for audiophiles & enthusiasts alike. With its silver-plated 99.999% Oxygen Free Copper Conductors the QED Reference XT400 Speaker Cable takes signal retention to the next level. Incorporating QEDs X-Tube Technology with a central hollow insulating rod this cable optimizes signal-contact & distribution further enhancing its performance & improving the overall listening experience. For those seeking to realize the full potential of their audio system the QED Reference XT400 Speaker Cable is an excellent entry point into silver-plated copper speaker cables.