QED Reference XT40i X-Tube Speaker Cable (Per Metre)

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Reference XT40i Speaker Cable, by QED Cables.

As befits a company rapidly closing in on its fifth decades at the forefront of speaker cable design, QED’s brand new XT40i speaker cable builds on the formidable reputation of the XT40 cable it replaces and offers a decisive step up in sound quality.

This pure oxygen-free copper cable uses an evolution of QED’s established X-Tube technology to guarantee superb timing and stereo imaging, and adds the brand new and highly innovative Air Gap dielectric to bring unheard-of rhythmic accuracy and musicality to a cable of this modest price. Very low DC resistance adds unrivalled frequency response to XT40i’s already potent audio capability. The result is a cable that advances on the class-leading standards set by its predecessor.

By increasing the separation of the conductors inside the cable, and therefore the amount of air between them, QED has created a low-loss Air Gap dielectric. This technology halves the dissipation and capacitance characteristics of the cable, and results in numerous audible improvements - particularly where timing and rhythmic accuracy are concerned. Despite this increased separation, though, XT40i retains the sort of cross-sectional area that makes it ideal for long cable runs.

Forming the cable conductors into a tube-like shape around a hollow insulating rod in the centre of the cable equalises current densities, delivers very low inductance and presents a consistent, even load to an amplifier. The result is a cable that retains more of the finest musical details, that handles rhythms and tempos in the most natural and musically satisfying way, and that outperforms rival designs costing far more.

Please note this is a SINGLE WIRE cable. For a stereo pair (left / right), please order two (x2) units.


  • Brand: QED
  • Range: Reference
  • Type: Single Wire, 2 Core
  • Construction: 99.999% Oxygen-Free Copper, Air-Gap Dielectric, X-Tube Construction
  • Sranded Diameter: 2.75 mm (min)
  • Outside diameter: 6 x 14 mm
  • Conductor area: 4 mm²
  • Dielectric properties: Air Gap
  • Loop resistance: 8.0 mΩ/m
  • Parallel capacitance: 35 pF/m
  • Dissipation factor @ 10 kHz: 0.0295
  • Self-inductance: 0.57 μH/m
  • Gauge: 12 AWG

Length Options

QED XT40i is available at £9.17 per-metre (ex-VAT), in any length up to 50.00 metres.

Lengths of 1.00 - 20.00 metres may be ordered directly using the purchase options above. For all other lengths please contact us to discuss your requirements.

Termination Options

QED XT40i can be supplied unterminated, or we can terminate each end of your cable with any of the following connectors:

  • CCS 4 mm Banana Plugs (Pair)
  • CCS 8 mm Spade Connectors (Pair)
  • QED Airloc Metal Banana Plugs (Pair)
  • QED Airloc Spade Connectors (Pair)

Termination Cost

The price for our professional termination service includes the cost of your chosen connectors, plus labour and materials.

If you wish to terminate this cable yourself, please select "None / Unterminated" for your amplifier / loudspeaker termination options, and order your required connectors from our wide range of termination options.

More Information

Delivery and Returns

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Please be advised that we may upgrade your delivery to a better service if we deem it appropriate to designated destinations at no additional cost. Please view our returns policy.
*Quoted delivery times are estimates and apply to normal working days for in stock items.


Try In Store:
Cable Configuration:
  • Single Wire

Cable Information

Cable Type:
  • Speaker Cables
5N Oxygen Free Copper
Silver / Grey


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