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QED Reference XT-400 Jumper Cable 20cm (Pair) - For One Speaker


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Condition: New

Brand-new, unused, unopened and undamaged item in original retail packaging (where applicable).


Please see QEDs website for further details.

Termination 2
Termination 1
Fisual Surefix Banana Plug (x2)
Fisual Surefix Banana Plug (x2)
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The classic 4mm banana plug termination applied to almost any speaker cable with heatshrink for the neatest of finishes. Fisual Surefix are genuine gold-plated banana plugs which can be applied to just about any speaker cable from our workshop engineers whether it's cable you already own or you're buying from us. Price here is for a pair of plugs.

Fisual Surefix Spade (x2)
Fisual Surefix Spade (x2)
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The Fisual Surefix Spade is a high quality termination for just about any speaker cable. This gold-plated 4mm spade can be applied to speaker cable ends by our on-site engineers in our workshop using a crimp-sealed and heatshrink method to eliminate any potential damage oxygen can inflict on exposed copper. Price here is for a pair of spades.

Order now for dispatch on
Wed 23rd October 2019

More Information


Silver plated oxygen free copper tubular conductor geometry. For use in the finest hi-fi and home theatre systems. This design delivers a massive cross sectional area using X-Tube technology to eliminate the skin effect whilst maintaining a user friendly figure of 8 geometry. This is QED's ultimate affordable upgrade for high end systems.

These high quality 20cm jumper cables are made by our on site cable technicians in our workshop. One pair of jumper cables is required for each speaker. We offer standard termination options which offer flexibility and also premium plug options, where a more solid sturdier plug is desired. 


One of the big problems as cable conductor size increases, is how to keep the inductance low. This is vital to reduce cable losses and prevent inaccuracies in the signal transfer process, i.e. distortion.

The normal way to do this is to use a number of individually insulated conductors within the cable construction. This method is utilised to great effect in the design of our Genesis Silver Spiral loudspeaker cables. However, this results in a product that has a very high quality sound performance, but is expensive to manufacture and can be difficult to terminate.

To take advantage of this design ethos, but in a more conventional format, X-TUBE forms the conductor in the shape of a tube with an inner aircore. This has the same effect as using multiple insulated conductors and ensures that high frequencies are transmitted cleanly, with the added benefit of ease of termination. This unique tubular conductor geometry also provides lower flux density within the conductors, which gives improved transparency to the sound.


1. At low frequencies both X-TUBE and conventional stranded/solid core speaker cable convey signals in a linear way. This is represented by the uniform green colour of the strands shown in the two diagrams above.

2. At higher frequencies X-TUBE retains a near-linear signal transfer, whereas the conventional stranded/solid core cable fails to efficiently conduct higher frequencies uniformly across the entire conductor area. The diagram shows excess current density at the periphery (designated in red) and rapidly deteriorating current density (green through to white) 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. The result is induced distortion and a compromise in the performance of the cable.

X-TUBE with Aircore technology exhibits much lower self inductance and is therefore less affected by this problem. The use of an innovative Polyethylene aircore enables a reduction in loop inductance to levels only usually achievable by using more costly and difficult to terminate cables.

  • Tick 20cm Jumper cable pair (enough for 1 speaker)
  • Tick Different plug termination options to suit your requirements
  • Tick Our standard termination option for jumper cables offer flexibility these are crimped and soldered for the best connection
  • Tick Fisual 'Surefix' plug option is useful for when a sturdier plug is desired
  • Tick Jacket OD - 6.00mm
  • Tick Cross-sectional area - 4.00mm²
  • Tick Loop resistance - 0.008 Ω/m
  • Tick Capacitance - 43pF/m
  • Tick Inductance - 0.50 µH/m
  • Tick Dissipation factor - 0.0400
  • Tick Recommended for all high end installations

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.


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.


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This item is available same day dispatch Monday to Friday, subject to cut-off times and excluding public holidays. Next working day and weekend deliveries available.

Delivery is available to most addresses within the United Kingdom. Some services may not be available to all postcodes. More information is available at the basket and on our delivery page.

We do not dispatch orders to addresses outside of the United Kingdom.