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REFERENCE
XT25 Bi-Wire

OVERVIEW

XT25 Bi-Wire

XT25 Bi-Wire with X-Tube™ Technology

XT25 Bi-Wire was designed as the natural complement to XT25, the 5-star-award winning*, entry-level X-Tube™ cable from QED. It incorporates four separate conductor bundles into a single, convenient X-Quad™ type geometry and is intended to present a much more enjoyable rendition of the musical performance when used in a bi-wire or bi-amped configuration.

In common with all our cables, XT25 Bi-Wire’s design was informed by the lessons learned during our exhaustive research into loudspeaker cable design, which was begun in 1995 and detailed in the recently updated Genesis Report. This report sets out the design principles to which we have adhered ever since and which resulted in the development of QED Supremus speaker cable – the ultimate expression of
sound through science without compromise. Each QED cable in the range is based on this unique concept and although their designs may be variously influenced by price, size or ease of use, each retains the basic original features of the flagship model. This gives even the base-model cables a sonic advantage over their similarly priced competitors. XT25 Bi-Wire, for example, is essentially a scaled down version of
the top-of-the-range Genesis Bi-Wire cable sharing many of its geometrical features but having a smaller cross-sectional area and using 99.999% oxygen-free copper conductors in place of the more expensive silver-plated variety.

FEATURES

Very Low DC Resistance

At QED we recognise that low DC resistance of the loudspeaker cable is of paramount importance for high fidelity signal transfer. This is because the speaker presents a frequency dependent load to the amplifier of which the cable forms a variable proportion. If resistance is allowed to be too large, then audible changes to the frequency response characteristics of the loudspeaker will be introduced which cannot be corrected by the amplifier’s negative feedback loop.

Very Low Inductance

Cable inductance is a prime cause of high-frequency attenuation and phase shift in loudspeaker cables. High inductance causes cable impedance to rise with frequency, reducing output in the very upper frequency range, sometimes preceded by response peaking.

Low-Loss Dielectric

It is not generally appreciated that electrical signals, moving at or near the speed of light in a circuit, do so via the medium of electromagnetic (EM) waveforms, which exist not only within the copper conductors themselves but also within the dielectric which insulates one from another. The movement of electrons around the circuit merely facilitates generation of the EM waveform, as their drift velocity, measuring only a few centimetres per second, is much slower than the speed of light.

X-Tube™ Technology

As frequency increases, electrons flow more and more towards the periphery of a conductor so that if the frequency is high enough only a very thin layer (or skin) on the outside of the conductor is used. This skin depth varies for different materials at a fixed frequency and in copper it means that if a conductor has larger than 0.66 mm 2 cross-sectional area, not all of that area is available for an analogue music signal to use.

SPECIFICATIONS

Specification

Outside diameter13.1 mm
Conductor area5.0 mm2
Conductor chemistry99.999% oxygen-free copper
Dielectric propertiesAir Gap (εr = 1.69)
Loop resistance7.0 mΩ/m
Parallel capacitance69 pF/m
Dissipation factor @ 10 kHz0.0001
Self-inductance0.36 μH/m
USE IT FOR..

WHAT THIS CABLE IS USED FOR

CONNECT YOUR:

AV Amplifier
Receiver
Home theatre systems
Stereo Amplifier

TO YOUR:

Speakers
REVIEWS

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"This kind of transparency is difficult for rivals to match"
"Near total transparency that is the mark of an award-winner."
"Natural, organic way of making music that’s wonderfully smooth"
"Cannot be faulted for build, technical parameters, sound or value"
"Very low power loss, across the audioband it’s the perfect solution for high-end systems"
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