QED X-Tube XT400 4m Speaker Cable

Product code: 1644
This item is unfortunately out of stock.
However, you may like these instead...

Alternatively, sign up for an account and we can notify you when it comes back into stock

QED X-Tube XT400 4m Speaker Cable

Purchase Information

  • Delivery 1-3 Working Days FREE
  • Choose a Delivery Date

RRP: £100.00

Now: £60.00

(prices inc VAT)
Free Delivery 1-3 Working Days 30 day money back guarantee

The flagship Aircore cable. Silver Plated Oxygen Free Copper tubular conductor geometry. For use in the finest hi-fi and home theatre systems.

X-TUBE with Aircore technology is a genuine breakthrough in loud speaker cable design. This new cable range delivers many of our world-renowned Genesis Silver Spiral cables - superb transparency, dynamic and control - in a more compact cable format.

X-TUBE is designed to be the natural upgrade for anyone using QED's Silver Anniversary speaker cables or those simply wanting the best performance for their hi-fi or home theatre systems.

QED X-Tube XT-400 Speaker Cable

  • Massive 2 x 4mm2 conductor crosssectional area
  • X-Tube-Information99.999% Silver Plated Oxygen Free Copper stranded braid conductors
  • Compact figure 8 construction
  • Polyethylene AirCore
  • Copper Mylar conductive wrap 
  • PTFE tape wrap, PVC outer jacket. 
  • Dimensions 12.7 x 6mm.



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.

FeeFo Reviews

Date / Score
Customer Comment Our Response
27-Aug-2014 Service: Product:
Service rating : Good website, items easy to find.
Product : I have used this cable before and was pleased to be able to obtain an additional length.
06-Jun-2013 Service: Product:
Service rating : Friendly Efficient service
Product : A noticeable increase in clarity and detail
20-Aug-2012 Service: Product:
very helpful when I phoned for advice
06-Aug-2012 Service: Product:
I was really pleased with the service and the prices on a recent purchase.
I was so pleased that I placed a another order then my satisfaction turned to anger.
The identical part which I had ordered a few days previously had increased in price.
This was made worse by the fact that...
Read More.
We were most concerned by your feedback. This item has not changed in price and we have absolutely no understanding of whether or how cookies could be used in the way you suggest. We can assure you we would never even consider any such devious practice. The use of cookies on our website is only... Read More.
Read more reviews on Feefo

There are no entries.

Post your question

Quick Order Processing

When you place an order before 2.30pm, Monday to Friday, we aim to process your order and dispatch it on that same day. Orders placed after 2.30pm are dispatched as soon as possible, usually no later than the next working day (Monday to Friday). Orders placed on Saturday and Sunday will be processed on Monday.

Free DeliveryFree UK Delivery

Our Free Delivery service for this item will be within 1-3 working days from placing your order, we will notify you by email when your order is dispatched and provide an indication of the expected delivery date. If you want it quicker then select Next Working Day delivery (FREE for orders over £50) in our secure checkout and we can deliver this item to you on the date shown at the top of the page, next to the price.


Next Working Day Deliveries.

We have options for Next working Day and Timed Next Working Day deliveries in our Secure Checkout.


Free Day of Choice Delivery

If you want delivery on a specific week day, add the item to your basket and then click on "Proceed to Checkout". Select a free delivery option and enter the required date in the Special Instructions box in the checkout. If for any reason we are unable to deliver on the day you have requested, we will contact you immediately to discuss how we can arrange a convenient delivery.


Shipping to European UnionWe ship to the EU

We are able to ship most items to EU countries provided they do not contain any glass. Delivery time is between 3-5 working days from order. We currently ship to the following countries:-

Austria, Belgium, Czech Republic, Denmark, Estonia, Finland, France, Germany, Hungary, Ireland, Italy, Latvia, Lithuania, Luxemburg, Monaco, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Sweden and Spain.

Once in our secure checkout, select the required country and you will see the delivery cost for your order. Cost is calculated by weight. All orders shipped overseas, should any import tax or duty become payable, this is the responsibility of the importer, (not usually applicable within the EU)


30 Day Money Back Guarantee

If for any reason you are not happy with your order:-

Please call us on 01623 672070 first to discuss why you may wish to return an item and to receive a returns number. We will take all steps possible to solve your problem / offer you a replacement or exchange product, or a refund.
We have a no quibble returns policy within 30 days of purchase, and we will issue a full refund provided the item is in a re-saleable condition, (i.e unused, unassembled, unmarked and in original unmarked packaging). It is the responsibility of the customer to return the item and ensure the package has been reasonably protected in return transit. You must include a copy of your invoice with the return.