QED Ruby Anniversary Evolution Loudspeaker Cable
The What Hi-Fi? Five Star award winning Ruby Anniversary Evolution cable is a completely new speaker cable from
QED laboratories in celebration of FORTY years at the forefront of UK speaker cable design. It utilizes QED “Aircore
Technology™” in a new miniature format to bring high end cable philosophies to the budget hi-fi market. It builds
on the success of the XT Evolution and Ruby Anniversary cables with which it shares a family heritage but now
incorporates increased conductor spacing to further reduce losses and distortions caused by cable capacitance.
QED Performance Ruby Anniversary Evolution Speaker Cable features the following QED Technologies:
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.
Low Loss Dielectrics
Music signals in a loudspeaker cable move back and forth many times every second. The insulating material used
to separate the send and return conductors from each other (the dielectric) has to be charged and discharged
every time. Not all of the energy stored in the dielectric during each charge cycle is completely returned during
each discharge cycle which has a detrimental effect on the fidelity of the sound you hear. That’s why at QED we
use low loss dielectric materials such as Polyethylene (PE) or Teflon™ (PTFE) in preference to cheaper PVC
alternatives found in inferior unbranded cables.
Air Core Technology
In loudspeaker cables electrical current does not flow smoothly because - rather like in a river - small eddy currents
are formed. Eddy currents in one conductor can affect the current flowing in an adjacent conductor so that
currents flowing in the same direction move away from each other. This “Proximity Effect” increases resistance as
frequency increases which has a detrimental effect on the fidelity of the sound you hear. QED Aircore Technology
builds on the science of X-Tube Technology and eliminates this problem by using individually insulated twisted
strands arranged around a hollow core to solve both the proximity and skin effects.
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. QED Airloc plugs eliminate this problem
by preventing oxidization and providing a gold plated mating surface which remains low resistance for ever.