Material: 99.999% OFC
24 AWG: twisted pair
LDPE: Low density PE
Dielectric: high performance
Screen: Dual electromagnetic
Wrap: aluminium mylar wrap
shield braid: 99.999% OFC
ferrite screen: inner Zn/Mn
Design: Ultra Low Jitter
Plugs: 24c Gold plated
QED Reference USB (A-B) Cable is designed to transmit HD digital audio between USB audio components including computers, storage device or high performance DACs with ultra low jitter.
The carefully engineered geometry including an integral Ferrite jacket, electrically isolated power conductors and an impedance controlled data lane to reduce timing errors within the digital signal for cleaner audio transmission.
QED Reference USB features an integral Zn/Mn floating ferrite jacket. When measured using an eye pattern generator at the correct data rate for high bandwidth USB, the cable exhibits 50% less jitter than competitor cables without the ferrite jacket. QED's findings indicate that ultra low jitter in an isochronous data stream results in an audible improvement in sound quality. In listening tests, the Reference cable with the ferrite jacket was preferred to samples without the jacket.
Five nines oxygen free copper conductors, LDPE dielectrics and legendary build quality combine to create audible sonic improvements. QED's extensive listening tests comparing competitor products at much higher price points have produced astonishing results. If you're not convinced, compare Reference USB to your current favourite cable as well as alternative brands and models at any price and you're guaranteed to hear the difference.
QED Reference USB uses a tightly controlled 24 AWG 99.999% OFC twisted pair which is bound by an aluminium mylar wrap with a drain wire pulled underneath. This arrangement is identical to that used in QED's high performance HDMI cables and is not usually found in a USB cable. Because the impedance of the data lane is kept strictly within defined limits, the jitter added to the data stream is kept to a minimum.
Many audiophiles feel that USB power cables carrying charging currents and PC power supply spikes near to the isochronous serial data stream can have an adverse affect on sound quality.
One solution is to remove the power cables altogether but this deviates from the USB spec and can cause inconvenience especially if the DAC electronics require USB power. QED Reference data lanes are uniquely electrically isolated by using a double layer shield comprising a 100% aluminium mylar wrap and drain wire connected to ground.