Gustard DAC-R26II Network Streaming DAC

1. Taw qhia thiab tshajview

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.

Cov yam ntxwv tseem ceeb muaj xws li:

• 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. Cov npe ntim khoom

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

• Main Unit (Gustard DAC-R26II)
• Hwj chim Cord
• USB Cable
• Chaw taws teeb tswj
• Bluetooth Kav hlau txais xov
• Gustard Warranty Card
• Phau Ntawv Qhia Pib Ceev

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.

Duab: Paub meej view of the Gustard DAC-R26II front panel, highlighting the display and control buttons.

1. Lub zog khawm: Switches between Standby and Operation states. The unit remains in standby when the rear power switch is on.
2. Zaub Screen: 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.

Duab: Paub meej view of the Gustard DAC-R26II rear panel, illustrating all input and output ports.

Analog Outputs:

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

Cov tswv yim digital:

• LAN (Network Input): For network streaming.
• USB: For connecting to a computer or other USB audio source.
• IIS Input (HDMI format): For high-resolution audio input, supporting DSD2048.
• Coaxial nkag: Standard S/PDIF coaxial digital input.
• AES/EBU Digital Input: Professional digital audio input.
• Optical Input: Standard S/PDIF optical digital input.

Lwm yam kev sib txuas:

• Firmware Update Port (UPDATE): For future firmware upgrades.
• Kav hlau txais xov Bluetooth: Connect the provided Bluetooth antenna for wireless connectivity.
• 10MHz Clock Input (BNC): For connecting an external 10MHz clock source.
• Voltage Xaiv (115V/230V): CEEB TOOM: 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.
• AC hwj chim tswv yim: Txuas lub xov hluav taws xob uas muab rau ntawm no.
• Lub hwj chim hloov: Main power on/off switch.

5. Kev teeb tsa thiab kev teeb tsa

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

1. Unboxing: Carefully remove the DAC-R26II and all accessories from the packaging. Retain the packaging for future transport or storage.
2. Qhov chaw: 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 Xaiv: TSEEM CEEB: Before connecting the power cord, verify that the Voltage Xaiv on the rear panel is correctly set to your local power supply (115V or 230V). Incorrect selection will cause damage.
4. Connect Bluetooth Antenna: Screw the provided Bluetooth antenna into its designated port on the rear panel.
5. Txuas Cov Suab Tawm: Connect the DAC-R26II to your amplub neej lossis lub mloog pob ntseg amplifier using either the XLR (balanced) or RCA (single-ended) analog outputs. Use high-quality cables for optimal sound.
6. Txuas Digital Inputs: 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. Txuas lub zog: 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. Hwj chim On: 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. Cov lus qhia ua haujlwm

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.

• Tswv yim Channel: 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 & SampLing Tus Nqi: Displays the current audio format (e.g., PCM, DSD) and its sampling rate (e.g., 44.1kHz, 768kHz, DSD256).
• Volume Display: 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.

• Ntau yam: 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. Cov ntawv qhia zaub mov

To access the settings menu, long press the Menu/Input Button (*) on the front panel. Use the +/- khawm 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. QHIA: Screen Brightness (AUTO, AUTO ALL OFF, AUTO DISPLAY OFF).
8. TXHEEM: 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. Qhib a web browser on a device in the same LAN and visit: http://r26.local.
5. Hauv 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 nplooj.

7. Chaw taws teeb tswj

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

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

1. Standby khawm: Toggles between Operation and Standby. Wakes up the screen in standby mode.
2. CEEB TOOM: Enters function settings.
3. Directional Pad: Up/Down: Switch function. Left/Right: Adjust options. Center: Unmute / Mute.
4. ROV QAB: Rov qab mus rau lub ntsiab screen.
5. VOL - / VOL +: Kho ntim.
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.

Ceev faj:

• Qhov kev khiav hauj lwm deb txawv nyob ntawm lub kaum sab xis.
• 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. Kev tu

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

• Ntxuav: 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.
• Qhov cua: Ensure that the ventilation slots on the unit are not blocked. Do not place the unit in an enclosed space without proper airflow.
• Fais fab tawm: Always power off the unit and disconnect it from the power outlet before cleaning or if it will be unused for an extended period.
• Tsis txhob ua kua: Do not expose the unit to liquids or excessive moisture. If liquid enters the unit, immediately disconnect power and contact customer support.
• Kub: Operate the unit within recommended temperature ranges. Avoid extreme hot or cold environments.

9. Kev daws teeb meem

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

Tsis muaj zog:

• 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.
• Tshawb xyuas qhov Voltage Selector on the rear panel is set correctly (115V or 230V) for your region.
• Sim lub qhov hluav taws xob nrog lwm lub cuab yeej kom paub tseeb tias nws ua haujlwm tau.

Tsis muaj suab tso zis:

• 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.
• Xyuas kom koj amplub neej lossis lub mloog pob ntseg amplifier is powered on and set to the correct input.
• 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.
• Xyuas kom 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. Khoom Specifications

Detailed technical specifications for the Gustard DAC-R26II:

Cov tswv yim digital:

• 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

Cov Lus Qhia Txog Cov Tso Tawm:

• Zaus teb: 20-20kHz /±0.2dB (OS mode)
• Dynamic Range: > 117dB
• Teeb liab-rau-suab nrov: > 122dB
• Channel Crosstalk: <-134dB @ 1kHz
• THD + N: <=0.003% @1kHz
• IMD: ≈0.008% @ 0dbfs
• RCA Cov zis theem: 2.5Vrms (Khoom kho)
• RCA Output Impedance: 100Ω
• XLR Output Level: 5.0Vrms (Khoom kho)
• XLR tso zis impedance: 100Ω

Miscellaneous Specifications:

• AC zog: AC115V/230V 50/60Hz; 115V, 230V (Manual switching)
• Kev siv fais fab: <20 W
• Chassis Qhov ntev: 330 x 260 x 65 mm (excluding pins 10mm)
• Qhov hnyav: 5.5, XNUMX KG

11. Warranty thiab Support

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.

Cov phiaj xwm tiv thaiv:

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

• 3-Xyoo Kev Npaj Tiv Thaiv: Extends coverage for 36 months.
• Ua tiav Kev Tiv Thaiv: Ib txoj kev npaj txhua hli them rau kev yuav khoom yav dhau los thiab yav tom ntej.

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 los yog koj daim warranty card.

Txoj cai rov qab: This product typically has a 30-day return/replacement policy from the date of purchase. Please consult your retailer for specific return terms.

12. Cov yeeb yaj kiab khoom

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