Gustard DAC-R26II Network Streaming DAC

1. はじめにview

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.

主な機能は次のとおりです。

• 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. 梱包リスト

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

• Main Unit (Gustard DAC-R26II)
• 電源コード
• USBケーブル
• リモートコントロール
• Bluetoothアンテナ
• Gustard Warranty Card
• クイックスタートガイド

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.

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

1. 電源ボタン: Switches between Standby and Operation states. The unit remains in standby when the rear power switch is on.
2. 表示画面: 現在の入力チャンネル、エンコード形式、およびsを表示します。ampling 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.

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

アナログ出力:

• XLR Right (Balanced) / XLR Left (Balanced): バランスオーディオ出力用。
• RCA Right (Single-Ended) / RCA Left (Single-Ended): For single-ended audio output.

デジタル入力：

• LAN (Network Input): For network streaming.
• USB： コンピューターまたはその他の USB オーディオ ソースに接続します。
• IIS Input (HDMI format): For high-resolution audio input, supporting DSD2048.
• 同軸入力: Standard S/PDIF coaxial digital input.
• AES/EBU Digital Input: プロフェッショナルなデジタルオーディオ入力。
• 光入力： Standard S/PDIF optical digital input.

その他の接続:

• Firmware Update Port (UPDATE): 将来のファームウェア アップグレード用。
• ブルートゥースアンテナ: ワイヤレス接続するには、付属の Bluetooth アンテナを接続します。
• 10MHz Clock Input (BNC): For connecting an external 10MHz clock source.
• 巻tageセレクター（115V/230V）： 警告： 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電源入力： 付属の電源コードをここに接続します。
• 電源スイッチ： 主電源のオン/オフスイッチ。

5. セットアップとインストール

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

1. 開梱: Carefully remove the DAC-R26II and all accessories from the packaging. Retain the packaging for future transport or storage.
2. 配置: Place the DAC on a stable, level surface, away from direct sunlight, heat sources, and excessive moisture. Ensure adequate ventilation around the unit.
3. 巻tage選択： 重要なステップ: Before connecting the power cord, verify that the 巻tageセレクター on the rear panel is correctly set to your local power supply (115V or 230V). Incorrect selection will cause damage.
4. Bluetoothアンテナを接続します: 付属の Bluetooth アンテナを背面パネルの指定されたポートにねじ込みます。
5. オーディオ出力を接続します: Connect the DAC-R26II to your amplifierまたはヘッドフォン amplifier using either the XLR (balanced) or RCA (single-ended) analog outputs. Use high-quality cables for optimal sound.
6. デジタル入力を接続します: 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. 接続電源： すべてのオーディオ接続が完了し、音量がtage selector is confirmed, connect the power cord to the AC Power Input on the rear panel, then plug it into a wall outlet.
8. 電源オン: 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. 操作手順

6.1. Display Screen Introduction

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

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

• 入力チャンネル： 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 & Sampリンレート： Displays the current audio format (e.g., PCM, DSD) and its sampling rate (e.g., 44.1kHz, 768kHz, DSD256).
• 音量表示: Shows the current volume level (e.g., -90dB to 00dB) or 'FIXED' for fixed output mode (volume bypass).

6.2. 入力チャンネルの選択

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 +/-キー on the front panel or remote to adjust the analog volume attenuation.

• 範囲： 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.設定メニュー

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

Menu Items Overview:

1. PCMフィルター: 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. 段階： Analog Output Phase Control (Non-inverted, Inverted).
7. 表示： Screen Brightness (AUTO, AUTO ALL OFF, AUTO DISPLAY OFF).
8. 待機する： 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. 開く web browser on a device in the same LAN and visit: http://r26.local.
5. では 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 ページ。

7. リモートコントロール

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

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

1. スタンバイボタン： Toggles between Operation and Standby. Wakes up the screen in standby mode.
2. メニュー： Enters function settings.
3. 方向パッド: Up/Down: Switch function. Left/Right: Adjust options. Center: Unmute / Mute.
4. バック： メイン画面に戻ります。
5. 音量 - / 音量 +: 音量を調整します。
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.

注意：

• 動作距離は角度により異なります。
• 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. メンテナンス

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

• クリーニング： 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.
• 換気： Ensure that the ventilation slots on the unit are not blocked. Do not place the unit in an enclosed space without proper airflow.
• 電源を切る： 清掃する前、または長期間使用しない場合は、必ずユニットの電源をオフにして、電源コンセントから外してください。
• 液体を避ける: Do not expose the unit to liquids or excessive moisture. If liquid enters the unit, immediately disconnect power and contact customer support.
• 温度： Operate the unit within recommended temperature ranges. Avoid extreme hot or cold environments.

9。 トラブルシューティング

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

電源なし:

• 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.
• ボリュームを確認するtage Selector on the rear panel is set correctly (115V or 230V) for your region.
• 別のデバイスで電源コンセントをテストし、機能していることを確認します。

サウンド出力なし:

• 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.
• あなたの amplifierまたはヘッドフォン amp充電器の電源がオンになっており、正しい入力に設定されています。
• 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.
• を確認してくださいampling 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. 製品仕様

Detailed technical specifications for the Gustard DAC-R26II:

デジタル入力：

• 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

アナログ出力：

• 周波数応答: 20-20kHz /±0.2dB (OS mode)
• ダイナミックレンジ: >117デシベル
• 信号対雑音比： >122デシベル
• チャネルクロストーク： <-134dB @ 1kHz
• THD+N: <=0.003% @1kHz
• IMD： ≈0.008% @ 0dbfs
• RCA出力レベル： 2.5Vrms(音量固定)
• RCA出力インピーダンス: 100Ω
• XLR出力レベル: 5.0Vrms(音量固定)
• XLR出力インピーダンス: 100Ω

Miscellaneous Specifications:

• AC電源: AC115V/230V 50/60Hz; 115V, 230V (Manual switching)
• 消費電力: <20W
• シャーシの寸法： 330 x 260 x 65 mm (excluding pins 10mm)
• 重さ： 5.5キロ

11. 保証とサポート

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.

保護プラン:

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

• 3年間の保護プラン: 保証期間を36か月延長します。
• 完全保護: 対象となる過去および将来の購入を対象とする月額プラン。

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 webサイトまたは保証カードをご覧ください。

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

12. 製品ビデオ

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