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QED Reference XT-40 Aircore Technology Speaker Cable


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How to Order

To order bare speaker cables, select the length you require and 'Add to Basket', price is per metre of cable. Please note: All speaker cables are supplied in one continuous length unless ordering with terminations. To add termination options please use the tool above. Select your required 'Amplifier Termination' & 'Speaker Termination' plugs, then select your required length and quantity. Finally 'Add to Basket' and the total price will be calculated.

AV Online

The QED XT40 is a special cable – detailed, balanced and authoritative, and we think it’s worth every penny. Go treat your system.



"Everything about the XT40 is clear and engaging....superb performance at the price"

The Reference XT-40 boasts QED's advanced X-Tube technology and a massive 4mm cross sectional area. This results in a cable that delivers clear sonic advantages over conventional cable designs by maintaining a flat frequency response within the audio band.

QED are so confident about the performance of the new XT-40, they urge enthusiasts to audition and compare it, not only to their favourite cable but also to alternative models at any price.

This award winning cable has 1 x 24 x 10/0.146mm 99.999% OFC closely woven braid wound round a hollow LDPE filler rod 2.8mm in diameter with a 100% coverage copper tape wrap in between; a paper wrap and pearl white finish PVC jacket comprise the cable dielectric.


  • Tick Dissipation Factor@10 kHz: 0.0576
  • Tick Nominal outside diameter 6.0 mm
  • Tick Capacitance 59.0 pF/m
  • Tick Loop Inductance 0.46 μH/m
  • Tick Loop resistance 8.0 mΩ
  • Tick Maximum continuous length available is 50m
X-Tube Technology

X-Tube Technology

At low frequencies both X-Tube and conventional stranded/solid core speaker cables convey signals in a linear way. However, at high frequencies, X-Tube retains a near-linear signal transfer, whereas the conventional cable fails to conduct uniformly across the entire conductor area. The result is that X-Tube delivers greater detail and fidelity across the audio spectrum which would other wise be lost in ordinary cables.

Large 4mm² Cross Sectional Area

Large 4mm² Cross Sectional Area

The 4mm cross sectional area means XT-40 exhibits very low resistance, allowing amplifiers to exert outstanding control over the speakers they are driving. In addition, its large cross sectional area makes it suitable for long cable runs.

While we do our best to keep this information up to date, please be aware that all specifications are subject to change by the manufacturer at any time.

Wire gauge 12 AWG
Jacket OD 6.00mm
Cross-sectional area 4.00mm²
Loop resistance 0.008 Ω/m
Capacitance 59pF/m
Inductance 0.46 µH/m
Dissipation factor 0.0576
Nominal outside diameter 6.0 mm

While we do our best to keep this information up to date, please be aware that all specifications are subject to change by the manufacturer at any time.