QED Reference OPTICAL Quartz Digital Audio Cable


QED Reference OPTICAL Quartz Digital Audio Cable

“we heard improvements in system sound when using the QED, including greater detail and dynamics”
What Hi-Fi? Sound and Vision – 5 Star, August 2009
What Hi-Fi? Awards Best Optical Interconnect 2012, October 2012

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QED Reference OPTICAL Quartz Digital Audio Cable

QED Reference Optical Quartz Digital Audio Cable is the first of its kind, consisting of 210 separate boro-silicate glass fibres. The cable allows you to experience stunning sound when connecting DACs, TV’s, CD players and Blu-Ray players to amplifiers or receivers because it has a much higher bandwidth and only 1/10th of the attenuation of traditional acrylic fibres. Reference Optical Quartz vastly exceeds the demands for high definition multi-channel digital audio with a bandwidth of over 150MHz which is totally unaffected by bending the cable.


QED Reference Optical QuartzReference Optical Quartz has in excess of 210 Glasscore™ fibres each thinner than a human hair. This ensures ultra low jitter because the smaller numerical aperture reduces the range of angles of acceptance leading to straighter signal paths.





QED Reference Optical FibreQED’s new Glasscore™ technology employs multiple fibre bundles of ultra-fine boro-silicate glass optical fibres (GOF) of no more than 50um each to make up the 1mm diameter necessary to conform to the Toslink standard connectors. Because the fibres are so small the different paths taken by the light rays are similar in length virtually eliminating the timing error and introducing less distortion and jitter. This has the effect of increasing bandwidth and the accuracy of the data transmission.


The quartz fibres are coated with a cladding of low Refractive Index to guide the light signal.


This vastly exceeds the demands for high definition multi-channel HD digital audio. In contrast to conventional acrylic glass optical cables quartz glass cables can deliver signals up to and including 24bit/192kHz with very low jitter.

Reference Optical Quartz can provide a much higher bandwidth than a single acrylic glass fibre with 1/10th of the attenuation.

very low jitterULTRA LOW JITTER

QED have calculated that jitter (distortions caused by timing differences between the different light paths) in conventional optical cables could typically reach up to 145ps. In Reference Optical Quartz, timing errors are virtually eliminated, introducing less distortion, jitter and ultra low loss < 0.03 dB/m.


  • Unique boro-silicate glass construction
  • Highly flexible 210 x 50 micron optical fibre bundle
  • Bandwidth >150MHz
  • Ultra low jitter
  • Stepped refractive index
  • Ultra low loss

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