QED Reference Coaxial Digital Audio 40

About the QED Reference Digital Audio Cable

The QED Reference Digital Audio 40 delivers an extremely high standard for Digital Coaxial S/PDIF signals. It is a definite winner for QED fans and the use of patented Digiloc connectors will reassure you of not only a good plug, but also many years of happy listening.

Reference Digital Audio 40 utilises a carefully engineered geometry to achieve the precise characteristic impedance required for the maximum transfer of S/PDIF signals. Silver plated conductors deliver a low resistance path for high frequencies and QED "Digiloc" plugs more closely match the cable's characteristic  impedance, reducing return loss by up to 1dB when compared to conventional RCA plugs. This ensures optimal signal transfer and improved micro-timing of the audio signal.

Just Listen: Silver plated signal carriers, effective high quality shielding and impedance matched cordage and plugs all combine to create audible sonic improvements when compared to the competition

Ultra Low Jitter: Through the use of factory controlled geometry and low permittivity foamed polyethylene dielectrics, Reference Digital Audio 40 maintains the correct characteristic impedance to match the transmission line between digital source and sink precisely. This makes for a very low jitter signal transfer which, listening tests have shown, leads to clearly audible sonic improvements. Jitter is the undesired deviation from true periodicity of an assumed periodic signal in electronics and telecommunications, often in relation to a reference clock source. A cable displaying ultra low jitter has been measured at typically 30ps.

75 Ohm Impedance Matched Digiloc RCA Plugs: Domestic S/PDIF interfaces use the traditional RCA phono connector which is not impedance matched to the 75 Ohm transmission line. This causes measurable insertion loss and an increase in jitter due to signal reflections at the connector boundaries. The all new Digiloc RCA plugs are more closely impedance matched than ever before and measurements have shown, reduce insertion loss by up to 1.2 dB compared to ordinary RCA plugs.

Triple Layer Electromagnetic Shielding: A dual layer closely woven 99.999% OFC shield braid and aluminium mylar wrap with 100% coverage comprise a triple layer electromagnetic shield coaxially spaced around the central signal carrier within a foamed polyethylene dielectric. This ensures that interference signals induced by nearby high current noise sources do not contribute to higher signal jitter than would otherwise be the case. By the same token the shielding prevents unwanted voltage induced interference escaping the cable which might affect nearby analogue signal carriers.

The History Of QED

In 1973 Bob Abraham and Ian Vine founded QED Audio Products and changed the way people think about hi-fi cables. By the time QED 79 strand was launched in 1978, it wasn’t considered' just another speaker cable' but a serious hi-fi component. During 1994 QED conducted the most extensive ever scientific investigation into the effects of speaker cable on hi-fi system performance. Read the results in “The Genesis Report”. Hear the results whenever you listen to your favourite music using QED cables.

QED's reputation for innovation and technical excellence is known throughout the world. The latest computer-aided design techniques allow their research and development team to keep pace with technological advances and deliver products that achieve the highest levels of performance and reliability. This is why QED speaker cables are recommended by so many of the world’s leading manufacturers of hi-fi and home theatre equipment. QED is Europe's number one award winning connectivity brand and has won more prestigious cable awards from ‘What Hi-Fi? Sound & Vision’ magazine than any other brand (Awards 1981–2013). - QED - The Sound Of Science

Main Features & Specifications

• Product Description: QED 75 Ohm Reference Digital Audio Coaxial Cable
• Design: 75 ohm coaxial design with closely matched locking plug for reduced return loss
• Conductor: Silver Plated 99.999% Oxygen Free Copper central conductor
• Dielectric: Extruded foamed Polyethylene (PE) dielectric
• Shield: Double 99.999% OFC braid plus Al/Mylar wrap for 100% electromagnetic screening coverage
• Connectors: Twin leaf 24c gold plated QED Digiloc RCA plugs
• featuring high purity copper contacts, hollow centre pin and low eddy current design
• Available Lengths: 600mm; 1 Metre; 3 Metre
• QED Warranty: Lifetime - Does not cover misuse or abuse

 Note: Features & Specifications Subject To Change Without Notice. E&OE.