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Supra USB Excalibur Silver Edition - Our best USB digital audio cable

Advance Info - product launch date August 2021

We have for a couple of years been developing an ultimate USB Cable, the result was USB Excalibur.

Supra USB Excalibur is supplied in a cardboard carton, just 17.5 (w) x 16.5 (d) x 4 (h) cm..

Our goal was simple: to make the world's best USB cable, with no compromises or shortcuts. Excalibur is a premium high speed cable with improved data and power transmission, a complement to the existing USB series.

Supra USB Excalibur is supplied in a black presentation bag, but you can use it to help protect the cable, if used in portable/remote situations.

Both the data pair and the power pair are optimised for their purpose, as the demands to transmit data and power are different.

The twisted data pair is made of PE insulated Silver-plated Oxygen Free Copper wires. The Silver layer is very thick, 3.8% of the total wire, for best conductivity and high velocity factor. Silver is great for high frequencies and high speed data transmission.

USB Excalibur, is optimised to handle 24-bit HD Audio and it's 90 Ohm characteristic impedance results in low attenuation.

The construction of the power conductors are totally different compared to the data pair. To avoid power losses and to maximize the conductor area we used 4 Tin-plated OFC wires in a star quad configuration. Star quad design and the seperate screen reduces any RFI greatly .

You probably recognise the design of the plugs - the USB plugs are siblings to our popular HDMI plug. Fully shielded in Aluminium.

The plugs are detachable to make it possible to route the cable within in 16 millimeter conduits including the contact. No more on-site cut-offs and re-soldering, jeopardising the typical Supra top notch performance.

USB cable (factory terminated)

Standard Features:

High Performance, High Speed - Uses a flexible cable with dual screens for the best RF pick-up protection.

One twisted pair for data (24-bit) and two star-quad pairs for power, with individual screens for minimal cross-channel interference.

Low capacitance and efficient noise rejection maintain signal integrity in long run interconnects.

PE-insulated wires with correct 90 Ohms impedance design.

24K gold plated and shielded connectors.

The connectors use aluminium housings to withstand tough applications and long term use.

Maximum Data Transfer Rate: 480 Mbits/second (as per USB 2.0 specifications).

Please note:
While USB 2.0 and 3.0 are physically and electrically compatible, USB 3.0 is a dual-link system that is not currently used for USB Audio.

Connectors used to terminate USB Excalibur cables are:
1) Standard Type A to Standard Type B - for use with most mains-powered DACs - available in the following lengths:
1m, 2m, 3m, 4m, 5m

Other lengths and connector types may be introduced in the future.

Technical Info
Mechanical Specifications  
Standard USB 2.0 Hi-Speed
Connectors USB Type A, Type B
Signal Direction Bi-directional
Application Examples Computer peripherals, DAC's
Data transfer rate 480 Mbit/s
Solder Tin Almit SR-34 Super
Cable strain relief Cable Clamp
Electrical properties  
Number of pairs 2 pairs - using 6 conductors wired to 4 pins
Conductor area (Data) 2x 0.24 mm2 / 23 AWG
Conductor area (Power) 4x 0.24 mm2 / 23 AWG
Number of strands 19 pieces
Strand dimension Ø 0.127 mm
Conductor material (Data) Silver plated Oxygen-free 5N Copper
Conductor material (Power) Tin plated Oxygen-free 5N Copper

Low capacitance PE
Shielding Aluminized PET foil
Jacket Heat and age resistant PVC
Flame retardant No
External dimension Ø 7.5 mm
Electrical performance  
Data transfer rate 480 Mbit / s
Resistance TBA / kilometre
Capacitance TBA / metre
Impedance 90 Ohm
Velocity factor 0.66x C (speed of light)
  info correct as of July 2021. E & O.E.