QED Reference High Resolution USB

1 m Usb A-B Cable made of 99.999% OFC Copper with Ferrite insulation. Especially Suitable for Hi-Res Audio Applications

New for 2020 comes an improved and upgraded QED Reference high-resolution USB cable with a thinner, more flexible profile and improved performance.

FEATURES

Impedance-controlled data lane
QED Reference High Resolution USB uses a 24 AWG, 99.999% oxygen-free copper twisted pair tightly controlled with low permittivity expanded polyethylene dielectrics, which is uniformly bonded by an aluminium / mylar jacket. This arrangement is similar to that used in our high-performance HDMI cables and is not usually found in a USB cable. Since the impedance of the data lane is kept strictly within defined limits of 90 Ω +/- 5% with a rise time of only 100 ps for a 3 m cable, it exceeds the specification provided in the USB 2.0 standard by more than half; therefore, timing error or jitter added to the isochronous data stream is kept to a minimum. This has the effect of increasing the enjoyment of actually listening to the music transmitted by the cable to an extent large enough to be statistically significant in listening tests conducted in our custom-built listening facilities.

Ultra-Low Jitter Geometry
The cable shows 50% less jitter than a comparable cable without ferrite sheathing. This proves conclusively that the combined technologies of impedance-controlled data lanes, electrically insulated power conductors and floating ferrite sheathing have the effect of halving cable-induced jitter in the digital transfer layer between source (digital music server) and music interface. Since USB audio is delivered in a real-time isochronous data stream, ultra-low jitter components distributed along the digital data path are believed to result in an audible improvement in sound quality. Certainly, in listening tests, the QED Reference High Resolution USB cable with ferrite coating and other technologies was preferred to samples without coating

Clean Path Audio Technology
Many audio enthusiasts believe that the use of USB power cables carrying charging currents and PC power noise along with the isochronous audio data stream can have a negative effect on sound quality. One answer is to remove the power cables altogether, but this deviates from USB specifications and can cause inconvenience, especially if the DAC electronics require USB power. Instead, the QED reference data lines are uniquely electrically insulated using a double-layer shielding consisting of a 100 per cent aluminium/Myllar casing and a grounded shield braid.

High Resolution Audio
QED Reference High Resolution USB is particularly well suited for Hi-Res audio applications simply because of its measurable and unrivalled jitter performance that delivers a performance that is both more musical and more enjoyable, and allows for a relaxing and long lasting listening session that leaves hi-fi enthusiasts eager to repeat the experience.

Ferrite Insulation Technology
QED Reference High Resolution USB features a unique floating Zn / Mn ferrite coating. Using a proprietary process, QED was able to distribute this radio frequency absorbing material evenly throughout the cable by means of a specially impregnated inner sheath. It is included to absorb high-frequency noise signals generated both internally and externally. It works to create a much quieter electrical environment in and around the cable to minimise jitter within the audio data stream.