2 PIECES OF 3 METERS IN THE BOX WITH FABRICATION BANANA PEED.
READY TO CONNECT DIRECTLY TO YOUR AMP AND SPEAKER.
Journey to XT25
The QED speaker cable story began in 1973 with the release of the world’s first custom speaker cables, the QED 42 and 79 wire, names now used in the audio industry. Building on this longstanding legacy of British speaker cable, QED embarked on an extensive cable parameters research program that began in 1995 and continued with the release of “The Voice of Science” in 2017. QED.
These reports reveal the “top-down” design principles that most recently resulted in the development of the QED XT25 speaker cable – the new class-leading standard in budget to mid-range speaker cables.
What are the features that make this cable so special?
X-Tube ™ The technology first came to prominence in 2005 with the launch of the world-renowned Silver Anniversary XT, the world’s most respected mid-range cable, and winning the What Hi-Fi Product of the Year award three years in a row. These design principles also reward the multiple award-winning XT40 speaker cables and the XT25.
As the frequency increases, more and more electrons flow around a conductor, so if the frequency is high enough, only a very thin layer (or skin) is used on the outside of the conductor. This “surface depth” changes for different materials at a fixed frequency, and in copper this means that if the cross-sectional area of a conductor is greater than 0.66 mm², not all of this area can be used to use an analog music signal. In SAXT, the “skin effect” problem has been effectively eliminated by the use of X-Tube ™ Technology, which works by placing all conductive material around a central hollow insulating rod. However, for ac signals
At the same time, instead of using a braided structure, a ring of conductors is formed into separate bundles with only a loose electrical connection, which are then twisted into a 90mm layer so that not a single conductor bundle is left inside or outside the cable (and therefore preying on proximity effect) long enough for it to become an audible problem. This geometry provides a more consistent signal distribution for more accurate music reproduction.
Low DC Resistance
At QED, we know that the low dc resistance of the speaker cable is essential for high-quality signal transmission. This is because the speaker presents a frequency-dependent load to the amplifier, where the cable creates a variable ratio. If the resistance is allowed to be too large, audible changes will be made in the frequency response characteristics of the speaker that cannot be corrected by the negative feedback loop of the amplifier. To provide a marked improvement over similarly priced cables in both our own and our competitors’ product lines without significantly increasing the overall size and flexibility of the cable, the XT25’s cross-sectional area (CSA) has been expanded to 2.5 mm 2 99.999% oxygen-free copper. This gives the new cable an instant lower dc resistance and therefore more accurate music reproduction.
Low Loss Dielectric
It is generally not appreciated that electrical signals traveling at or near the speed of light in a wire do so via electromagnetic (EM) waveforms that exist in the dielectric surrounding the conductors as well as in the conductors themselves. The movement of electrons along the conductor facilitates the generation of the EM waveform, as their “drift velocity” is only a few centimeters per second. It is therefore important to provide the dielectric material used to insulate and protect the central conductors of the speaker cable. It is of the type that “allows” EM waveforms to be built without appreciable loss. Dielectric losses should be as close to unity as possible, as each material is a measure of what happens in a vacuum. Like its predecessors, the XT25 is specially formulated with the lowest relative permittivity practically available at 1.69 It uses a low density polyethylene (LDPE) dielectric.
QED research has shown that cables with low capacitance are generally preferred over their higher capacitance counterparts in listening tests, mainly because low loss dielectrics are used. The use of LDPE and careful control of the conductor spacing results in a cable with very low capacitance per meter and a loss factor (loss tangent) of 0.0001 at 10 kHz.
What is the result of all these techniques?
The graph below shows how the XT25’s dc resistance effectively remains unchanged across the entire audible frequency band compared to a conventional cable of the same cross-sectional area. Sonic advantages of a low loss dielectricImprovements in current distribution, coupled with I, place the new cable in a class well above cables with a less complex geometry.
So, QED X-Tube ™ If you don’t invest in the XT25, you can lose a lot of the performance of your expensive speakers.
Are you convinced?
QED AirLoc ™ designed to ensure the XT25 from your dealer will sound as good as new for life. Make sure you get the most out of your new purchase by asking them to plug in Forté chips.
What makes XT25 unique?
1. Award-winning legacy guaranteed
All QED cables are designed using the top-down principle. The XT25 represents essential musical performance delivered in a more affordable package than our no-money objectless Supremus cable. QED more What Hi-fi won? With more awards than any other single brand and the XT25, this legacy comes at a reasonable price. Unlike most other manufacturers, QED offers an unlimited lifetime warranty; This means that if your cable does not reach its full potential during its lifetime, we will replace it free of charge.
2. X-Tube ™ Technology …. but slightly different
In loudspeaker wires, high-pitched sounds are forced out of the conductor and therefore can use less and less of the available cross-sectional area as the pitch increases. This is called the “Skin Effect”. This means that for high frequencies the resistance of the cable appears much higher than for lower pitched sounds. Eddy currents in a conductor can affect 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. These phenomena have a detrimental effect on the fidelity of the sound you hear.
3. Low Loss Dielectric
Music signals on the speaker wire move back and forth many times per second. The insulating material (dielectric) used to separate the sending and return conductors must be charged and discharged each time. Not all of the energy stored in the dielectric during each charge cycle is fully returned during each discharge cycle, which has a detrimental effect on the fidelity of the sound you hear. Therefore, in QED, Polyethylene (PE) or Teflon ™ We use low loss dielectric materials such as (PTFE).
4. 99.999% Oxygen-Free Copper
Speaker cables must have a large current carrying capacity. If the electrical resistance of the cable is too large, some of the music signal will be lost, causing a detrimental effect on the fidelity of the sound you hear. To prevent 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. To squeeze out the final performance degradation from the conductors, we make sure there are no impurities in the copper that would eliminate the object of making them too big. That’s why we only use 99.999% oxygen-free copper.
Unique proprietary technology and trademarked geometries plus all of our award-winning heritage come together to create audible sound improvements over other speaker cables.