QED XT400 Loudspeaker Cable
XT400 features silver-plated oxygen-free copper tubular conductor geometry and is for use in the finest hi-fi and
home theatre systems. This design delivers a massive cross-sectional area using X-Tube™ technology to eliminate
the skin effect whilst maintaining user friendly “figure of 8” geometry. This is QED’s ultimate affordable upgrade
for high end systems.
Speaker Cable features the following QED Technologies:
Silver Plated 99.999% Oxygen Free Copper
Speaker cables have to carry a lot of current. If the electrical resistance of the cable is too large, part of the music
signal will be lost,
causing a detrimental effect on the fidelity of the sound you hear. To stop this from happening
we make the resistance of our speaker cables as small as possible. We do this by using the largest practical cross-
sectional area of copper within the size constraints of each cable. In order to squeeze the last drop of performance
from the conductors we make sure that there are no impurities in the copper which would defeat the object of
making them so large. That’s why we use 99.999% oxygen free copper exclusively.
Although copper is a very good electrical conductor, silver is even better. By using it in our top of the range cables
we can improve conductance without making the cable larger. As the pitch of the sound increases the current
flows more and more to the outside of the conductors so we cunningly use silver plated 99.999% oxygen free
copper conductors to reduce resistance only where it is needed, thus saving you money.
In loudspeaker cables high pitched sounds are forced to travel towards the outside of the conductor and so are
able to use less and less of the available cross-sectional area as the pitch increases. This is called the “Skin Effect”.
It means that for high frequencies the resistance of the cable appears to be much higher than it does for lower
pitched sounds. This has a detrimental effect on the fidelity of the sound you hear. QED X-Tube Technology solves
this problem by creating a hollow tubular conductor geometry through which each frequency can pass with equal
ease when compared to traditional solid or stranded conductors.
If a bare wire termination method is used the exposed copper quickly oxidizes increasing the resistance of the
cable, which has a detrimental effect on the fidelity of the sound you hear. Available as an option, QED Airloc plugs
eliminate this problem by preventing oxidization and providing a gold plated mating surface which remains low
resistance for ever.