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Stock Location
| AV Distribution Hub: | 20+ |
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5-year warranty included
If you decide your order isn't suitable for any reason you can return it - just let us know within 30 days of receiving it. Please keep hold of all the original packaging until you're sure you want to keep the order.
Eligibility for Money Back Guarantee
Important: For hygiene and software licensing reasons, some items are only eligible for our Money Back Guarantee if they are returned to us unused and sealed in the original packaging with all software still "unregistered." Details of exclusions are shown within the product descriptions. Products include:
- Monitors and Headphones
- Earplugs and Ear Protection
- Reeds and mouthpieces for woodwind and brass instruments
- Mouth and Lip-Care Products
- CDs, DVDs and Software
We can collect your return for a small fee, or you can send it back to us yourself. The collection fee can be found in the returns information on each product's page on AV.com.
In the unlikely event that any item in this order is faulty, damaged or incorrect on receipt, notify us within 14 days and we'll arrange a free collection.
When returning an order please ensure products are appropriately packaged and protected, to prevent them from getting damaged.
This table provides an overview of your statutory consumer rights, compared with our standard returns policy and optional extended money back guarantee and warranty.
| UK & Europe | EU Standard | AV.com Standard | AV.com Optional |
|---|---|---|---|
| Return Period | 14 days | 30 days | up to 180 days |
| Standard delivery charges refunded? | Yes | Yes | Yes, up to 30 days |
| Upgraded delivery charges refunded? | Standard costs only | Standard costs only | Standard costs only |
| Free collection on cancellation | No | No | Yes, up to 30 days |
| Free collection if defective, delivered damaged or incorrect item | Yes, within 14 days | Yes, within 14 days | Yes, within 30 days |
We are unable to accept returns of any custom made items designed to work together as a unique package and some items are only eligible for money back guarantee if they are returned to us unused and sealed in the original packaging. For full information on our returns policy, please refer to our returns and refunds information guide.
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Key Features
=The QED Reference XT400 Speaker Cable has been recognized for its exceptional performance with the prestigious What HiFi? Best Speaker Cable Award, solidifying its reputation as a top choice for audiophiles and enthusiasts alike. With its silver-plated 99.999% Oxygen Free Copper Conductors, the QED Reference XT400 Speaker Cable takes signal retention to the next level. Incorporating QED’s X-Tube Technology with a central hollow insulating rod, this cable optimizes signal-contact and distribution, further enhancing its performance and improving the overall listening experience. For those seeking to realize the full potential of their audio system, the QED Reference XT400 Speaker Cable is an excellent entry point into silver-plated copper speaker cables.
Product Ref: 197224
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.
