B.M.C. Pure Dac Panduan Pemilik - Halaman 9

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USB Connection

USB Interconnections

The PureDAC requires a cable terminated with a USB 2 or USB 3 "B" type connector. The

computer side depends on the type of computer. For use with a standard laptop or

desktop computer the "A" type is preferred.

For USB audio the interconnecting cable quality matters. We suggest making a

listening test yourself in order to determine what cable best suit your taste.

The interconnection should be not too long and should not have any ferrite beads.

Cables that are too lengthy may fail at high transmission frequencies. We suggest

USB cable of between 1 and 2 meters. If a longer cable is needed, B.M.C. suggests

using active cables with length up to 5m without additional losses.

Not every "audiophile" cable provides consistent performance. USB connectors should fit tightly to the

computer as well as the PureDAC.

Operational stability and maximum cable length also depend on the connected computer.

B.M.C. offers active USB cables which are delivering a stable and clean signal to the DAC.

USB Linking

Depending on the connected computer, the USB link may fail when hot-plugging or

restarting. Without a hardware link the external USB sound device does not exist and

consequently can not be used.

If you experience this difficulty, remove the USB cable, power off the PureDAC, re-plug the

cable and power on the DAC again. The TUSB driver control window should show a

connected unit (Windows only). Under Linux type "lsusb" into any terminal emulator and

check the XMOS device of the PureDAC is listed.

USB linking may also fail when there are ground/earth problems. Do not defeat the earth pin on the

PureDAC.

USB Cable With External USB Power Supply

Some accessory manufacturers offer self-powered USB cables which do not use the computer USB bus

supply voltage. Such cables offer no benefit with the PureDAC, since the PureDAC's USB section is not using

the USB bus power supply.

Galvanic USB Isolation

Generally it is a good idea to keep the electrical noise of a computer outside of the PureDAC. However, such

an isolation device must support USB 2.0 in "Hi Speed" mode with up to 480Mbit/s.

There are fiber optical USB extenders claiming those specifications. While some may perform well, B.M.C.

can not guarantee proper functioning when using non-standard connections.

USB2 B-Type

USB2 A-Type

B.M.C. LINK

TOS

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COAX

USB