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QED Reference XT-400 Speaker Cable

QED

Product Reference

1297

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Condition: New

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

Warranty

Please see QEDs website for further details.

Rated 5/5 based on 4 customer reviews
Speaker Termination
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Amplifier Termination
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Fisual Surefix Banana Plug (x2)
Fisual Surefix Banana Plug (x2)
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+ £6.00
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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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+ £10.00
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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.

QED Metal Airloc Banana Plug (x2)
QED Metal Airloc Banana Plug (x2)
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+ £10.00
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QED's classic banana plug gets the premium treatment. This metal-cased gold-plated plug is great addition to speaker cable of the highest quality. The plug is 'cold welded' using specialist crimping tooling at our workshop which looks and feels fantastic. Price here is for a pair of plugs.

QED Plastic Airloc Banana Plug (x2)
QED Plastic Airloc Banana Plug (x2)
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+ £8.00
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A great value permanent banana plug from cable supremo QED. These plastic barrelled plugs complements any decent quality speaker cable, 'cold welded' onto copper cable in our on-site workshop with specialist crimping tools. Price here is for a pair of plugs.

AudioQuest Fixed BFA Plug (x2)
AudioQuest Fixed BFA Plug (x2)
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+ £15.00
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This is AudioQuest's own termination of choice when it comes to applying plugs to the ends of speaker cable. These BFA camcon-style plugs are silver-plated for a supreme connection between your amp and speakers and have a nice-to-the-touch rubberised barrel to aid grip when pushing in and out. The AudioQuest BFA plugs can only be applied by ourselves in our workshop using specialist tooling. Price here is for a pair of plugs.

QED Plastic Airloc Spade Plug (x2)
QED Plastic Airloc Spade Plug (x2)
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+ £10.00
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A great value permanent spade plug from cable supremo QED. These plastic barrelled plugs complements any decent quality speaker cable, 'cold welded' onto copper cable in our on-site workshop with specialist crimping tools. Price here is for a pair of plugs.

Fisual Surefix 90 Degree Banana Plug (x2)
Fisual Surefix 90 Degree Banana Plug (x2)
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+ £9.00
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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. The 90 degree banana plug design saves space and greatly reduces stress on the terminals.

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Was: £28.00
£25.00

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.

X-TUBE WITH AIRCORE TECHNOLOGY HOW IT WORKS 

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.

THE SIGNAL 

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 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
  • Tick Maximum continuous length available is 50m

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.

Diagram

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.

All of our reviews are provided by real customers with verified purchases.

Reviews for this product.

18 August 2016

- Cheshire

No comment provided by customer.
5
05 April 2013

- Rochdale

No comment provided by customer.
5
01 November 2010

No comment provided by customer.
5
08 June 2010

No comment provided by customer.
5

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