Gustard U12 Digital Audio Interface User Manual

1. Introduktion

The Gustard U12 is a high-performance USB Digital Audio Interface designed to convert USB audio signals into various digital output formats. It utilizes the XMOS X-CORE 32-bit digital signal processing unit, offering robust multi-core processing capabilities for high-fidelity audio. The U12 supports asynchronous USB Audio Class 2.0 and features an independent power supply for optimal audio performance.

Nøglefunktioner omfatter:

Support for 32-bit / 384kHz asynchronous 2.0 audio.
Native 32-bit / 384kHz XMOS DAC capabilities.
Precision audio clock circuit using 0.1PPM active crystals.
Independent power supply for enhanced audio quality.
Multiple digital outputs: Coaxial (RCA), Optical, AES/EBU, and IIS (HDMI port).

2. Pakkens indhold

Sørg for, at alle genstande er til stede ved udpakning:

Gustard U12 Digital Audio Interface Unit
Strømkabel
Mini-CD with XMOS Driver (version 3.20 or later)

3. Enhedslayout

3.1 Frontpanel

Front view of two Gustard U12 units, one black and one silver, showing the digital display for sample sats.

Figur 3.1: Front view of the Gustard U12, displaying the current sample sats.

The front panel features a digital display that indicates the current audio sample rate. There are no physical controls on the front panel.

3.2 Bagpanel

Rear panel of the Gustard U12 showing power input, AES, Coaxial, IIS, Optical, and USB IN ports.

Figur 3.2: Rear panel connections of the Gustard U12.

Bagpanelet indeholder alle nødvendige input- og output-tilslutninger:

230V/115V AC Input: Strømforbindelse.
AES: AES/EBU digital audio output.
COAX: Coaxial (RCA) digital audio output.
IIS: IIS digital audio output via HDMI port.
OPTISK: Optical (Toslink) digital audio output.
USB IN: USB 2.0 input for connection to a computer.

4. Opsætningsvejledning

Strømtilslutning: Connect the provided power cable to the 230V/115V AC input on the rear panel of the U12 and then to a suitable power outlet.
USB-forbindelse: Connect a USB cable from your computer (Windows, macOS, or Linux) to the USB IN port on the rear panel of the U12.
Digital udgangsforbindelse: Connect one of the digital outputs (Coaxial, Optical, AES/EBU, or IIS) from the U12 to the corresponding digital input on your Digital-to-Analog Converter (DAC) or audio amplivligere.
Driver Installation (Windows Users):
- Insert the provided mini-CD into your computer's CD drive.
- Locate and install the XMOS driver. A common driver version is 4.13.0 (e.g., "XMOS-Stereo-USB-Audio-Class2-Driver-3033_v4.13.0").
- Følg instruktionerne på skærmen for at fuldføre driverinstallationen. Genstart computeren, hvis du bliver bedt om det.
- For optimal performance, it is recommended to use ASIO output when configuring your audio playback software (e.g., jRiver Media Player, Foobar2000).
Driver Installation (macOS/Linux Users): The U12 is generally plug-and-play with macOS and Linux operating systems, requiring no additional driver installation.
Første gang tændt: Once all connections are secure and drivers are installed (if applicable), the U12 will power on automatically when the computer is turned on or when the USB cable is connected. The front display will show the current sample sats.

5. Betjeningsvejledning

5.1 Lydafspilning

After successful setup, select the Gustard U12 as your audio output device in your computer's sound settings or preferred audio playback software. Begin playing audio, and the U12 will automatically detect and display the incoming sample rate on its front panel.

5.2 Supported Output Formats and Sample Priser

Coaxial (RCA), Optical, AES/EBU: These outputs conform to IEC60958 and AES3-r2009 standards, supporting a maximum resolution of 24-bit / 192kHz.
IIS (HDMI port): This output can transmit up to 32-bit / 384kHz audio.

The U12 employs two independent active crystals to provide precise clock signals for different sample rate series: one for 44.1/88.2/176.4/352.8kHz and another for 48/96/192/384kHz. Only the crystal corresponding to the selected clock rate operates, preventing mutual interference.

5.3 Strømstyring

The U12 features an automatic standby mode. When your computer enters sleep mode or is powered off (provided the USB power is also off), the U12's display will turn off. Waking your computer or restoring USB power will instantly reactivate the U12 and its display.

Close-up of the Gustard U12's digital display showing different sample rates like 128 and 384.

Figur 5.1: The U12's display indicating various sample satser.

6. Vedligeholdelse

To ensure the longevity and optimal performance of your Gustard U12, follow these maintenance guidelines:

Rensning: Brug en blød, tør klud til at tørre enhedens yderside af. Undgå at bruge flydende rengøringsmidler eller slibende materialer, da de kan beskadige overfladen.
Placering: Place the U12 on a stable, flat surface with adequate ventilation. Avoid placing it near heat sources, direct sunlight, or in areas with high humidity.
Sluk: Hvis enheden ikke skal bruges i længere tid, anbefales det at tage stikket ud af stikkontakten.
Interne komponenter: Do not attempt to open the unit or service it yourself. Refer all servicing to qualified personnel. Opening the unit may void your warranty.

Indre view of the Gustard U12 showing the XMOS chip and other circuit board components.

Figur 6.1: Indre view of the U12's XMOS chip and circuitry.

Indre view of the Gustard U12 showing the toroidal transformer and power supply components.

Figur 6.2: Indre view highlighting the independent power supply with toroidal transformer.

7. Fejlfinding

Problem	Mulig årsag	Løsning
Ingen strøm / Skærm slukket	Strømkablet er ikke tilsluttet korrekt. Computer is off or in sleep mode, and USB power is disabled. Problem med stikkontakt.	Ensure power cable is firmly connected to the U12 and the wall outlet. Check if the computer is powered on and not in sleep mode. Ensure USB power is active. Test stikkontakten med en anden enhed.
No sound / Device not recognized by computer	USB-kabel ikke tilsluttet eller defekt. Incorrect audio output device selected in computer settings. Missing or corrupted Windows driver. Operating system update interfering with driver (e.g., Windows 10 updates).	Verify USB cable connection; try a different USB port or cable. Select "Gustard U12" as the default audio output device in your computer's sound settings. Reinstall the XMOS driver from the provided mini-CD or download the latest version from the manufacturer's webwebsted. Ensure the driver is compatible with your operating system version.
Juttering, clicking, or loss of sync on Coaxial output at high sample rates (e.g., 192kHz/24bit)	Coaxial signal strength may be lower than standard (standard is 500mV p-p, U12 measured at 300mV p-p). Cable quality or impedance mismatch.	Try using a high-quality 75-ohm coaxial cable. If issues persist, consider using the Optical or IIS output for higher sample rates, as these may offer more robust signal integrity for certain DACs. Sænk sample rate if the issue is specific to 192kHz/24bit on Coaxial.
Enheden slukker tilfældigt	Problem med intern komponent. Ustabilitet i strømforsyningen.	Sørg for, at enheden har tilstrækkelig ventilation og ikke overopheder. Try connecting to a different power outlet or a power conditioner. Hvis problemet fortsætter, skal du kontakte kundesupport for at få hjælp.

8. Specifikationer

Mærke	Gustard
Modelnummer	U12
Kompatible enheder	Personlig computer
Forbindelsesteknologi	USB, XLR (for AES/EBU)
Antal kanaler	4
Varens vægt	1.5 kilo
Operativsystemsupport	Linux, Windows, macOS
Lydindgang	USB
Maksimum Sample Sats	384 KHz
Digitale udgange	Coaxial (RCA), Optical (Toslink), AES/EBU (XLR), IIS (HDMI)
UPC	652252617682, 674387795905, 686560911064
ASIN	B00PU3R6KY

9. Garanti og support

For garantioplysninger eller teknisk support henvises til den dokumentation, der fulgte med dit køb, eller kontakt producenten direkte. Gem din købsbevis til garantikrav.

Manufacturer: Gustard

Gustard U12