Gustard DAC-R26II Network Streaming DAC

1. Introduction et plusview

The Gustard DAC-R26II is a high-performance 26-bit R2R Digital-to-Analog Converter with integrated network streaming capabilities, designed for discerning audiophiles. It features a discrete R-2R resistor ladder network for natural sound reproduction and supports a wide range of high-resolution audio formats.

Les principales caractéristiques comprennent :

• Discrete R-2R Architecture: Utilizes a 26-bit R-2R resistor ladder network for high linearity and natural audio texture.
• Full-Format High-Resolution Decoding: Supports DSD2048 (via IIS) and PCM 32-bit/768kHz, with a DIRECT DSD mode for preserving original bitstream details.
• High-Precision Clock Module: Integrated GCLK-02 clock module with PLL technology reduces digital jitter and supports external 10MHz clock input.
• Comprehensive Interface Coverage: Features USB (XMOS XU216), Optical, Coaxial, IIS, AES, and LAN digital inputs, along with RCA/XLR analog outputs.
• Custom Class-A LPF Circuit: Fully discrete Class-A low-pass filter output stage optimizes sound layers and enhances transient response.
• Seamless Multi-Protocol Streaming: Supports mainstream network protocols for high-resolution music via wired and wireless connections.

This manual provides detailed instructions for setting up, operating, and maintaining your DAC-R26II to ensure optimal performance and longevity.

2. Liste de colisage

Please check the contents of your package upon unboxing. The following items should be included:

• Main Unit (Gustard DAC-R26II)
• Cordon d'alimentation
• Câble USB
• Télécommande
• Antenne Bluetooth
• Gustard Warranty Card
• Guide de démarrage rapide

Image: Contents of the Gustard DAC-R26II package, including the main unit, power cord, USB cable, remote control, Bluetooth antenna, warranty card, and quick start guide.

3. Front Panel Introduction

The front panel of the DAC-R26II features a clear display and intuitive controls for easy operation.

Image : détaillée view of the Gustard DAC-R26II front panel, highlighting the display and control buttons.

1. Bouton d'alimentation : Switches between Standby and Operation states. The unit remains in standby when the rear power switch is on.
2. Écran d'affichage : Shows the current input channel, encoding format, and sampling rate. Displays menu items when entering the settings menu.
3. Setting/Volume Button (-): Typically used to decrease volume. In the menu interface, it is used to switch options.
4. Menu/Input Button (*): Short press to switch input selection; Long press to enter or exit the menu; Short press within the menu to toggle items.
5. Volume Button (+): Typically used to increase volume. In the menu interface, it is used to switch options.

4. Rear Panel Interface

The rear panel provides all necessary input and output connections for integrating the DAC-R26II into your audio system.

Image : détaillée view of the Gustard DAC-R26II rear panel, illustrating all input and output ports.

Sorties analogiques :

• XLR Right (Balanced) / XLR Left (Balanced): For balanced audio output.
• RCA Right (Single-Ended) / RCA Left (Single-Ended): For single-ended audio output.

Entrées numériques:

• LAN (Network Input): For network streaming.
• USB: Pour la connexion à un ordinateur ou à une autre source audio USB.
• IIS Input (HDMI format): For high-resolution audio input, supporting DSD2048.
• Entrée coaxiale : Standard S/PDIF coaxial digital input.
• AES/EBU Digital Input: Entrée audio numérique professionnelle.
• Entrée optique : Standard S/PDIF optical digital input.

Autres connexions :

• Firmware Update Port (UPDATE): Pour les futures mises à jour du firmware.
• Antenne Bluetooth : Connectez l'antenne Bluetooth fournie pour une connectivité sans fil.
• 10MHz Clock Input (BNC): For connecting an external 10MHz clock source.
• Voltage Sélecteur (115V/230V) : AVERTISSEMENT: Ensure both switches are set to match your local power supply (110V or 220V). Failure to do so will damage the internal transformer upon power-up.
• Entrée de courant alternatif: Branchez ici le cordon d'alimentation fourni.
• Interrupteur: Interrupteur principal marche/arrêt.

5. Configuration et installation

Follow these steps to set up your Gustard DAC-R26II:

1. Déballage : Carefully remove the DAC-R26II and all accessories from the packaging. Retain the packaging for future transport or storage.
2. Placement: Place the DAC on a stable, level surface, away from direct sunlight, heat sources, and excessive moisture. Ensure adequate ventilation around the unit.
3. Voltage Sélection : ÉTAPE CRITIQUE : Before connecting the power cord, verify that the Voltage Sélecteur on the rear panel is correctly set to your local power supply (115V or 230V). Incorrect selection will cause damage.
4. Connecter l'antenne Bluetooth : Screw the provided Bluetooth antenna into its designated port on the rear panel.
5. Connecter les sorties audio : Connect the DAC-R26II to your amplifier ou casque amplifier using either the XLR (balanced) or RCA (single-ended) analog outputs. Use high-quality cables for optimal sound.
6. Connecter les entrées numériques : Connect your digital audio sources (e.g., computer, CD player, network streamer) to the appropriate digital input ports (USB, Optical, Coaxial, IIS, AES, LAN).
7. Connecter l'alimentation : Once all audio connections are made and the voltage selector is confirmed, connect the power cord to the AC Power Input on the rear panel, then plug it into a wall outlet.
8. Mise sous tension : Flip the main Power Switch on the rear panel to the 'ON' position. The unit will enter standby mode. Press the Power Button on the front panel to turn on the unit.

6. Mode d'emploi

6.1. Display Screen Introduction

The R26II uses a large OLED display to provide real-time status and facilitate functional operations.

Image : Example of the DAC-R26II display showing active input, clock status, audio format, and volume mode.

• Canal d'entrée : Indicates the currently selected input (e.g., COAX, AES, OPT, BT, USB, Streamer, IIS).
• External Clock Display: Shows 'EXT' if an external 10MHz clock is detected and used.
• Encoding Format & SampTaux de ling: Displays the current audio format (e.g., PCM, DSD) and its sampling rate (e.g., 44.1kHz, 768kHz, DSD256).
• Affichage des volumes : Shows the current volume level (e.g., -90dB to 00dB) or 'FIXED' for fixed output mode (volume bypass).

6.2. Input Channel Selection

The R26II has a total of 7 input channels. In the main screen state, short press the Menu/Input Button (*) on the front panel to cycle through the available inputs: COAX → AES → OPT → BT → USB → Streamer → IIS.

6.3. Volume Regulation (VOLUME)

In the main screen state, use the +/- keys on the front panel or remote to adjust the analog volume attenuation.

• Gamme: 00dB to -90dB (Total 90 steps).
• FIXED Mode: When volume is at 00dB, increasing it further enters Fixed Output Mode (Volume Bypass). Decrease volume to exit FIXED mode.

6.4. Menu Paramètres

To access the settings menu, long press the Menu/Input Button (*) on the front panel. Use the +/- boutons to adjust the currently selected option. Long press the Menu/Input Button (*) again to return to the main page.

Menu Items Overview:

1. PCM FILTER: PCM Digital Filter Adjustment (Fast, Medium, Slow).
2. DSD DIRECT: DSD Direct Mode (Disable, Enable).
3. NOS MODE: PCM NOS (Non-Oversampling) Mode (Disable, Enable).
4. REF CLOCK: Reference Clock Source Selection (Internal, EXT.10MHz).
5. IIS MODE: IIS Pin Sequence Mode (MODE1, MODE2, MODE3, MODE4).
6. PHASE: Analog Output Phase Control (Non-inverted, Inverted).
7. AFFICHER: Screen Brightness (AUTO, AUTO ALL OFF, AUTO DISPLAY OFF).
8. ETRE PRÊT: Standby Mode Behavior (Manual, Auto).

6.5. Streamer Usage (Network Bridge)

The DAC-R26II includes a network bridge system co-engineered with CelAudio, supporting various streaming protocols.

Image: Screenshot of the network bridge configuration interface, showing various streaming protocols.

1. Connect the R26II to your LAN via the RJ45 port.
2. Select the 'Streamer' input channel on the DAC.
3. Wait for the system to boot (approx. 1 minute). The screen will show "DSD 24.5M" or similar.
4. Ouvrir un web browser on a device in the same LAN and visit: http://r26.local.
5. Dans le web interface, you can enable/disable protocols (AirPlay, Roon Bridge, UPnP, HQPlayer NAA, Spotify) to optimize performance.
6. Firmware updates for the bridge are also handled via this web page.

7. Télécommande

The DAC-R26II is equipped with a dedicated remote control for convenient operation.

Image: The Gustard DAC-R26II remote control with labeled buttons.

1. Bouton de veille: Toggles between Operation and Standby. Wakes up the screen in standby mode.
2. M E N U: Enters function settings.
3. Pavé directionnel : Up/Down: Switch function. Left/Right: Adjust options. Center: Unmute / Mute.
4. ARRIÈRE: Retour à l'écran principal.
5. VOL - / VOL + : Régler le volume.
6. DAC / AMP / STREAM Buttons: These buttons are used to switch the remote's control mode for different Gustard products (DAC, Amplifier, Streamer). Long press for 5 seconds to switch between modes. Ensure the remote is in 'DAC' mode for controlling the R26II.

Prudence:

• La distance de fonctionnement varie en fonction de l'angle.
• The remote control may not function properly if there are objects between the remote control and the sensor.
• Remove the batteries if the remote control will not be used for an extended period (one month or longer).
• If the battery leaks, thoroughly clean all residue from the battery compartment and install new batteries.
• Using this remote control may cause malfunctions in other devices controlled by infrared signals.

8. Entretien

Proper maintenance ensures the longevity and optimal performance of your Gustard DAC-R26II.

• Nettoyage: Use a soft, dry cloth to clean the exterior of the unit. Avoid abrasive cleaners, solvents, or chemical sprays, as these can damage the finish.
• Ventilation: Ensure that the ventilation slots on the unit are not blocked. Do not place the unit in an enclosed space without proper airflow.
• Éteindre: Always power off the unit and disconnect it from the power outlet before cleaning or if it will be unused for an extended period.
• Évitez les liquides : Do not expose the unit to liquids or excessive moisture. If liquid enters the unit, immediately disconnect power and contact customer support.
• Température: Operate the unit within recommended temperature ranges. Avoid extreme hot or cold environments.

9. Dépannage

If you encounter issues with your DAC-R26II, please refer to the following common troubleshooting steps:

Pas d'alimentation :

• Check if the power cord is securely connected to both the DAC and the wall outlet.
• Ensure the main Power Switch on the rear panel is in the 'ON' position.
• Vérifiez le volumetage Selector on the rear panel is set correctly (115V or 230V) for your region.
• Testez la prise de courant avec un autre appareil pour confirmer son bon fonctionnement.

Pas de sortie audio :

• Confirm the correct input source is selected on the DAC's front panel or via remote.
• Check all audio cables (XLR, RCA, digital inputs) for secure connections.
• Assurez votre amplifier ou casque ampL'amplificateur est allumé et réglé sur la bonne entrée.
• Verify the volume level on the DAC is not muted or set too low. If 'FIXED' mode is active, ensure your amplifier's volume is adjusted.
• If using USB, ensure the correct drivers are installed on your computer (if applicable) and the DAC is selected as the output device.
• For network streaming, ensure the DAC is connected to the network and the streaming service/app is configured correctly.

Intermittent Audio / Dropouts:

• Check digital cable quality and length. Long or low-quality cables can cause signal degradation.
• Assurez-vous que le sampling rate of the source matches the DAC's capabilities or is within its supported range.
• If using network streaming, check your network connection stability and bandwidth.
• If 'NOS MODE' is enabled with high-performance software, a click sound may occur when switching between different sampling formats. This is normal behavior for NOS mode.

If the issue persists after trying these steps, please contact Gustard customer support for further assistance.

10. Spécifications du produit

Detailed technical specifications for the Gustard DAC-R26II:

Entrées numériques:

• COAX/AES/OPT: PCM 16-24bit/44.1-192kHz; DSD DoP64
• USB/Streamer: PCM 16-32bit/44.1-768kHz; DSD DoP64-DOP256; NATIVE DSD: DSD64-DSD512
• IIS: PCM 16-32bit/44.1-1536kHz; NATIVE DSD: DSD64-DSD2048 (DSD2048: @ DSD direct mode)
• 10M Input Interface (BNC): Input impedance 50 Ohm, 0dBm-20dBm, CMOS square wave 0.2V-3.3V, sine wave 0.5-3.3V

Sortie analogique :

• Réponse en fréquence : 20-20kHz /±0.2dB (OS mode)
• Plage dynamique : >117 dB
• Rapport signal sur bruit: >122 dB
• Diaphonie des canaux : <-134dB @ 1kHz
• Distorsion harmonique totale + bruit: <=0.003 % à 1 kHz
• IMD : ≈0.008% @ 0dbfs
• Niveau de sortie RCA : 2.5Vrms (VOLUME FIXE)
• RCA Output Impedance: 100 Ω
• XLR Output Level: 5.0Vrms (VOLUME FIXE)
• Impédance de sortie XLR : 100 Ω

Miscellaneous Specifications:

• Alimentation secteur : AC115V/230V 50/60Hz; 115V, 230V (Manual switching)
• Consommation d'énergie : < 20 W
• Dimensions du châssis : 330 x 260 x 65 mm (excluding pins 10mm)
• Poids: 5.5 kg

11. Garantie et assistance

Gustard products are manufactured to high standards. For warranty information, please refer to the Gustard Warranty Card included in your package. Keep your purchase receipt as proof of purchase.

Plans de protection :

Additional protection plans may be available for purchase from your retailer:

• Plan de protection de 3 ans : Prolonge la couverture de 36 mois.
• Protection complète : Un forfait mensuel couvrant les achats admissibles, passés et futurs.

For technical support, service, or warranty claims, please contact your authorized Gustard dealer or the manufacturer directly. Contact information can typically be found on the Gustard website ou votre carte de garantie.

Politique de retour: This product typically has a 30-day return/replacement policy from the date of purchase. Please consult your retailer for specific return terms.

12. Vidéos produits

Watch these official videos for more information on the Gustard DAC-R26II.