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HiFi Review – d+USB Class S

HiFi Review – d+USB Class S

Hong Kong magazine HiFi Review has done a review with 7 USB cables. It is our pleasure the Neo by Oyiade d+USB cable has excellent comments, and the reviewer bought 2 d+USB cable for his CAS reference. You can find more information or purchase directly here.

d+USB Class S

The architecture under digital environment

Although the fact that the sound quality under the digital environment is influenced by the quality of AD/DA converter and jitter accuracy of audio clock is well-known, there are other factors that actually change the sound such as noise contamination or matching with the appreciation, driver, and PC hardware.
And for the high-performance serial bus, it is influenced by the system architecture of software, connectors and circuit patterns, ICs and cables. In addition, isochronous transfer that is applied in many USB audio I/Os have no error correction despite of carrying a huge amount of information at the same time.

“d+ USB series” was designed for smooth and lossless data transmission in both of the software and hardware system structure. The important thing in the digital signal transmission is passing the signals from sending side to receiving side as natural as possible. Because the signal flows in a cable is, even if it is digital, the electric signal, and the analog-like approach considering the electric property would be very important and effective.

We took an approach to protect the signal from external and internal noise by electro-magnetic wave and control its electric conductivity and permittivity.

●Impedance matching
We carefully made an adjustment impedance matching by advanced technology by considering pitch, diameter, and strand of conductors. Consequently, we achieved accurate data transmission and excellent stability with attenuation of terminal reflection wave.

●Selected materials

For class S, considering bus-powered, we selected the hi-quality PCOCC pure copper conductor. Because the signal flows on the surface by skin effect, the PCOCC which has no grain boundary and flat surface is very effective for even data transmission. Therefore, it actualizes the stable data transmission and power supply. In addition, the conductor diameter of the class S is set to AWG22/AWG18 which is twice as thick as the regular cable for powerful sound reproduction.

●Flat design architecture
The flat designed cable prevents the signal loss caused by cable bend, change of impedance and electrostatic capacitance. And it protect signal from external/internal noise and electro-magnetic wave by combination of TPE outer sheath, double-shielding, and twist-pair structure.

The contacts of the USB connectors are made of bronze alloy with selected combination plating for each class. For class S, it is a combination of platinum and rhodium.

Eye Pattern
In telecommunication, an eye pattern, also known as an eye diagram, is an oscilloscope display in which a digital data signal from a receiver is repetitively sampled and applied to the vertical input, while the data rate is used to trigger the horizontal sweep. It is so called because, for several types of coding, the pattern looks like a series of eyes between a pair of rails.

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