1. Introduction
The Pro-Ject Pre Box S2 Digital is a high-performance digital-to-analog converter (DAC), headphone amplifier, and preamplifier designed to deliver exceptional audio quality from various digital sources. This manual provides essential information for setting up, operating, and maintaining your device.
2. Safety Instructions
- Always connect the device to a power source that matches the voltage specified on the unit.
- Do not expose the device to rain or moisture.
- Avoid placing the device near heat sources or in direct sunlight.
- Ensure proper ventilation around the unit.
- Do not open the casing; refer all servicing to qualified personnel.
- Disconnect the power supply before cleaning or if the unit will be unused for an extended period.
3. Package Contents
Verify that your package contains the following items:
- Pro-Ject Pre Box S2 Digital unit
- 5V DC power supply
- USB cable
- User manual
- Remote control (optional, may be sold separately)
4. Product Overview
4.1 Front Panel
Image 1: Front panel of the Pro-Ject Pre Box S2 Digital. It features a headphone output, input selection buttons, a display screen, filter and menu buttons, and a volume/navigation knob.
- Headphone Output (6.3mm jack): Connect your headphones here.
- Input Buttons (Up/Down arrows): Select between USB, Coaxial, and Optical inputs.
- Display Screen: Shows current input, sample rate, volume level, and menu options.
- Filter Button: Cycles through various digital filter settings.
- Menu Button: Accesses the device's settings menu.
- Volume/Navigation Knob: Adjusts volume; press to confirm menu selections.
4.2 Rear Panel
Image 2: Rear panel of the Pro-Ject Pre Box S2 Digital. Connections include USB, Coaxial, Optical, 5V Power input, and Left/Right RCA analog outputs.
- USB Input: Connect to a computer or compatible digital source.
- Coaxial Input: Connect to digital audio sources via an RCA coaxial cable.
- Optical Input: Connect to digital audio sources via a TOSLINK optical cable.
- Power 5V: Connect the supplied 5V DC power adapter.
- Output Left/Right (RCA): Connect to an amplifier, active speakers, or other analog audio equipment.
5. Setup and Connections
Follow these steps to set up your Pre Box S2 Digital:
- Power Connection: Connect the supplied 5V DC power adapter to the "Power 5V" input on the rear panel. If connecting via USB to a computer, the unit may draw power from the USB port, but using the dedicated power supply is recommended for optimal performance.
- Source Connection:
- USB: Connect a USB cable from your computer (PC/Mac) or compatible digital audio player to the USB input on the Pre Box S2 Digital. For Windows PCs, you may need to install specific drivers from the Pro-Ject website for full functionality, especially for MQA and DSD playback. Mac OS typically does not require additional drivers.
- Coaxial/Optical: Connect your digital audio source (e.g., CD player, streamer, TV) to the Coaxial or Optical input using appropriate cables.
- Output Connection:
- Analog Output: Connect RCA cables from the "Output Left/Right" jacks on the rear panel to the analog input of your amplifier, preamplifier, or active speakers.
- Headphone Output: Plug your headphones into the 6.3mm jack on the front panel.
- Initial Power On: Once all connections are secure, the unit will power on. The display will illuminate, indicating the active input and current sample rate.
Image 3: Example setup showing the Pre Box S2 Digital connected to a laptop via USB and headphones plugged into the front panel.
6. Operating Instructions
6.1 Basic Operation
- Input Selection: Use the Input Up/Down buttons on the front panel or the remote control to cycle through USB, Coaxial, and Optical inputs. The active input will be shown on the display.
- Volume Control: Rotate the Volume/Navigation Knob clockwise to increase volume and counter-clockwise to decrease it. The current volume level is displayed. When headphones are connected, the volume control affects only the headphone output. When headphones are disconnected, it controls the analog RCA outputs.
- Mute: Press the volume knob briefly or use the mute button on the remote control to mute/unmute the audio output.
6.2 Menu Navigation and Settings
Press the Menu button to enter the settings menu. Use the Volume/Navigation Knob to scroll through options and press it to select. Use the Filter button to exit the menu.
- Digital Filters: The Filter button cycles through various digital filter characteristics (e.g., Fast Roll-off, Slow Roll-off, Minimum Phase). Experiment to find your preferred sound.
- Display Brightness: Adjust the brightness of the front panel display.
- Output Mode: Configure whether the RCA outputs are fixed or variable (controlled by the volume knob).
- Firmware Version: View the current firmware version of your device.
6.3 MQA and DSD Playback
The Pre Box S2 Digital supports MQA (Master Quality Authenticated) and DSD (Direct Stream Digital) audio formats.
- MQA: When playing MQA content, the display will show "MQA" and a colored dot (blue or green) indicating the MQA status (e.g., "MQA Studio" for verified master quality). Ensure your playback software (e.g., Tidal, Roon) is configured for MQA passthrough or rendering to the device.
- DSD: The unit will automatically detect and display "DSD" when playing DSD audio files.
Image 4: The Pre Box S2 Digital shown with its remote control, which provides convenient access to input selection, volume, mute, filter, and menu functions.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound from outputs. | Incorrect input selected, volume too low, cables loose, muted. | Verify input selection, increase volume, check all cable connections, ensure unit is not muted. |
| MQA/DSD not displaying correctly. | Incorrect software settings, missing drivers (Windows). | Ensure playback software is configured for MQA/DSD passthrough. Install latest drivers from Pro-Ject website for Windows. |
| Intermittent audio or noise. | Poor cable connection, ground loop, power supply issue. | Check all connections. Try a different USB cable or power supply. Consider a USB isolator or ground loop isolator if necessary. |
| Unit does not power on. | Power supply not connected or faulty. | Ensure the 5V DC power supply is securely connected to both the unit and a working power outlet. If using USB power, ensure the USB source is active. |
8. Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the unit. Do not use liquid cleaners or solvents.
- Ventilation: Ensure that the ventilation openings are not blocked to prevent overheating.
- Storage: If storing the unit for an extended period, disconnect it from power and store it in a cool, dry place.
9. Specifications
| Feature | Detail |
|---|---|
| Brand | Pro-Ject |
| Model Number | PREBXS2DIGSIL |
| Material | Aluminium |
| Product Dimensions (L x W x H) | 4.65 x 4.06 x 1.42 inches |
| Item Weight | 12.9 ounces |
| Maximum Supply Voltage | 5 Volts |
| Minimum Supply Voltage | 5 Volts (DC) |
| Number of Channels | 1 |
| Mounting Type | Wall Mount (Note: This may refer to the power adapter, as the unit is typically desktop placed.) |
| Upper Temperature Rating | 85 Degrees Celsius |
10. Warranty and Support
Pro-Ject products are designed and manufactured to the highest quality standards. Your device is covered by a manufacturer's warranty. For specific warranty terms, duration, and to register your product, please refer to the warranty card included in your package or visit the official Pro-Ject Audio Systems website. For technical support or service inquiries, please contact your authorized Pro-Ject dealer or distributor.
You can find more information and support resources on the Pro-Ject Store on Amazon.
