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QED XT40 Speaker Cable - Per Metre


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Ex VAT: 8.25

What Hi-Fi Awards 2014 "Best speaker cable"

The XT40 builds on the British company’s XT range, and consists of sturdy plugs at either end of a strong, yet pliable jacket; designed for very low resistance and easy termination. Availble per metre. Simply adjust the quantity you require.

Available - Ships within 2-3 days.

Condition:Brand new in original retail packaging

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Warranty length Lifetime
Brand QED Cables
Product Award What HiFi Awards 2014 - Best Buys

Tech Specs

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

For best results use QED Airloc™ Forte banana plugs.

Product Description

The QED 40 is designed to have very low resistance per metre with its 4mm² cross sectional area and is easy to terminate due to its traditional shot-gun geometry and soft easy tear PVC outer jacket. It features QED X-Tube™ technology which obviates the skin effect (a plague of large cross-sectional area cables) by removing the centre of the conductor and placing it at the periphery of the electric field (acting towards the center) which would otherwise create a larger self-inductance.

In this way the hollow central core at once eliminates the skin effect (thus maintaining a flat frequency response within the audio band) and reduces the expected self inductance measurement of parallel conductors of this size and separation by half.

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 cables fail to conduct uniformly across the entire conductor area.

In standard speaker cables at high frequencies current flow is highest at the periphery with rapidly deteriorating current density towards the centre of the conductor. The effect of this is to reduce the actual cross sectional area of the cable at 15kHz to less than 75% of that at low frequencies.

This results in higher distortion and compromises the performance of the cable. X-Tube™ with polycore technology exhibits much lower self-inductance and is therefore less affected by this problem.

The polycore technology reduces loop inductance to levels only achievable using more costly and difficult to terminate cables. The result is more high frequency detail, less distortion and greater performance.

Press Reviews

  • 'An exceptional performer and a natural upgrade from a beginner's cable.' (What Hi-Fi Magazine)

  • 'There's no standout characteristic in this well balanced cable other than the way it handles all elements of the music so evenly. Everything about the XT40 is clear and engaging; from its packaging to cable construction and, most important of all, its superb performance at the price.' (Hi-Fi Choice Magazine Feb 2015)

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