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QED XT25 Speaker Cable (Per Metre)

 

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QED's latest entry-level XT25 speaker cable intended as a 'first upgrade' cable, a more affordable alternative to the XT40.

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Condition:Brand new in original retail packaging

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Features

Warranty length Lifetime
Brand QED Cables

Tech Specs

- Cross-sectional area: 2.5mm2
- Wire gauge: 14 AWG
- Jacket outside diameter: 3.96mm
- Loop inductance: 0.52 μH/m
- Loop resistance: 13.4 mΩ/m
- Capacitance: 35.0 pF/m
- Dissipation factor: (@10kHz) 0.0001
- Conductors: 10 x 19/0.13mm
- Insulation: LDPE jacket (100% coverage)
- Wrap: Aluminium Mylar tape wrap
- Plugs/spades: QED Airloc Forte banana

Product Description

QED's latest entry-level XT25 speaker cable is intended as a 'first upgrade' cable for systems of all types: stereo, home cinema or custom install. Its 2.5mm² cross-sectional area makes it ideal for longer runs.

Like all QED speaker cables, XT25 adheres to the principles outlined in the Sound of Science Report and comes with an unlimited lifetime warranty. It is cold-welded with QED's 4mm Airloc plugs or spades.

X Tube Technology

X-Tube technology introduced in the world-renowned Silver Anniversary XT, is the most highly awarded mid-range cable in the world, winning the What Hi-Fi Product of the Year three years in a row. These design principles also grace the multiple award-winning XT40 speaker cable.

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 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 mm2 cross-sectional area not all of that area is available for an analogue music signal to use.

In SAXT the “skin effect” problem was effectively eliminated by the use of X-Tube Technology which works by placing all of the conducting material around a central hollow insulating rod. However, for a.c. signals, changing magnetic fields generated by the flow of current set up eddy currents in nearby conductors which force current to flow only in areas furthest away from conductors carrying current in the same direction and vice versa. This “proximity effect” has a detrimental influence on current distribution in a speaker cable even if it utilises X-Tube Technology.

Aircore Technology

These are tackled by combining existing Aircore and X-Tube Technologies into a new X-Tube variation. By forming the conductors into a tube-like shape with a hollow centre, current densities at higher frequencies are maintained because the electric field which contributes towards the skin effect acts towards the centre of the conductor from where the conductive material has been removed.

At the same time instead of using a braided structure a ring of conductors is formed into separate bundles with only a loose electrical association which are then twisted into a 90mm lay so that no single conductor bundle remains on the cable's inside or outside long enough to become an audible problem. This lends to a consistent signal distribution for more accurate musical reproduction.

Low DC Resistance

QED recognises 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 for by the amplifier’s negative feedback loop.

In order to provide a marked improvement over similarly priced cables in both our own and our competitors’ ranges without increasing the overall size and flexibility of the cable substantially, the cross-sectional area (CSA) of XT25 has been enlarged to 2.5mm2 of 99.999% oxygen-free copper. This instantly gives the new cable a low d.c. resistance and therefore a more accurate musical delivery.

Low Loss Dielectric

It is not generally appreciated that the electrical signals moving at or near the speed of light in a wire do so via the medium of electromagnetic (EM) waveforms which exist within the dielectric which surrounds the conductors as well as within the conductors themselves.

The movement of electrons along the conductor merely facilitates generation of the EM waveform as their “drift velocity” is only a few centimetres per second. It is therefore important to ensure that the dielectric material used to insulate and protect the central conductors of the speaker cable is of a type which “permits” the establishment of EM waveforms without appreciable loss.

Dielectric losses

Dielectric losses are directly proportional to the “permittivity” of the material used and as this a measure of each material relative to that in a vacuum it should be as close to unity as possible. Like its predecessors, XT25 uses a specially formulated low-density polyethene (LDPE) dielectric which at 1.69 has the lowest relative permittivity practically available.

QED research has shown that low capacitance cables are generally preferred in listening tests over high capacitance counterparts and this is usually because low-loss dielectrics have been utilised. The use of LDPE and careful control of conductor spacing results in a cable with a very low capacitance per meter and a dissipation factor (loss tangent) of 0.0001 at 10kHz.

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