Introduction
Thank you for choosing the Pro-Ject BT Box S2 HD. This high-definition Bluetooth audio receiver is designed to provide seamless wireless music streaming with exceptional sound quality, supporting advanced codecs like aptX HD. This manual will guide you through the setup, operation, and maintenance of your device to ensure optimal performance.
Safety Instructions
Please read these instructions carefully before operating the device. Keep this manual for future reference.
- Do not expose the device to rain or moisture.
- Do not place any objects filled with liquids, such as vases, on the device.
- Ensure proper ventilation; do not block ventilation openings.
- Only use the power supply provided by the manufacturer.
- Disconnect the power plug during lightning storms or when unused for long periods.
- Refer all servicing to qualified service personnel.
Package Contents
Verify that your package contains the following items:
- Pro-Ject BT Box S2 HD Unit
- Power Supply
- Bluetooth Antenna
- User Manual
Product Features
The Pro-Ject BT Box S2 HD offers a range of features designed for high-quality audio streaming:
- Wireless music streaming in high definition: Bluetooth 5.0 + supports aptX, aptX-HD & SBC codecs.
- Effective operating range of approximately 10 meters (33 feet).
- Versatile output options: RCA analog and Toslink digital outputs (switchable).
- Quick and easy setup with fast auto pairing (3 to 5 seconds).
- External antenna for improved signal reception.
Setup and Connections
Follow these steps to set up your BT Box S2 HD:
- Connect the Antenna: Screw the supplied Bluetooth antenna onto the connector on the rear panel of the BT Box S2 HD.
- Power Connection: Connect the power supply to the 5V DC input on the rear of the unit and then plug it into a wall outlet.
- Audio Output Connection:
- Analog Output (RCA): Connect the RCA outputs (Left/Right) to an available analog input on your amplifier or audio system using appropriate RCA cables.
- Digital Output (Toslink Optical): Connect the Optical output to a digital optical input on your DAC or amplifier using a Toslink optical cable.
Note: Only one output type (analog or digital) can be used at a time. The unit automatically detects which output is connected.

Figure 1: Rear panel connections of the BT Box S2 HD. Shows the antenna port, optical output, RCA left/right outputs, and 5V power input.

Figure 2: Front panel of the BT Box S2 HD, displaying the power button on the left and the 'Pair' button on the right.
Operating Instructions
Powering On/Off
Press the power button on the front panel to turn the unit on or off. A small LED indicator will illuminate when the unit is powered on.
Bluetooth Pairing
To pair your BT Box S2 HD with a Bluetooth-enabled device (e.g., smartphone, tablet):
- Ensure the BT Box S2 HD is powered on.
- Press the 'Pair' button on the front panel. The pairing indicator will begin to flash, indicating it is in pairing mode.
- On your Bluetooth device, enable Bluetooth and search for available devices.
- Select "Pro-Ject BT Box S2 HD" from the list of found devices.
- Once connected, the pairing indicator on the BT Box S2 HD will glow steadily.
The device features fast auto-pairing, typically connecting within 3 to 5 seconds after being put into pairing mode.
Music Playback
Once paired, you can stream audio from your Bluetooth device to the BT Box S2 HD. Control playback (play, pause, skip tracks, volume) directly from your source device.
Maintenance
To ensure the longevity and optimal performance of your BT Box S2 HD:
- Clean the unit with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Keep the unit away from direct sunlight, heat sources, and excessive dust.
- Do not attempt to open the casing; this will void the warranty.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound output. | Incorrect cable connection, wrong input selected on amplifier, BT Box S2 HD not powered on, device not paired. | Check all cable connections. Ensure the correct input is selected on your amplifier. Verify the BT Box S2 HD is powered on. Re-pair your Bluetooth device. |
| Cannot pair with Bluetooth device. | BT Box S2 HD not in pairing mode, device too far, interference, previously paired device connected. | Press the 'Pair' button on the BT Box S2 HD. Ensure your device is within 10 meters. Move away from other wireless devices. Disconnect from any other Bluetooth devices. |
| Sound drops out or is distorted. | Device too far from BT Box S2 HD, obstacles between devices, interference. | Move your Bluetooth device closer to the BT Box S2 HD. Remove any large obstacles. Avoid placing near Wi-Fi routers or other strong signal sources. |
Specifications
| Feature | Detail |
|---|---|
| Model | BT BOX S2 HD - BLACK UNI |
| Bluetooth Version | 5.0 |
| Supported Codecs | aptX, aptX-HD, SBC |
| Connectivity Technology | Bluetooth, RCA |
| Compatible Devices | Smartphone, Speaker |
| Audio Output Mode | Stereo |
| Outputs | RCA Analog, Toslink Digital Optical |
| Product Dimensions (L x W x H) | 12.6 x 7.87 x 5.51 inches |
| Item Weight | 1.51 pounds |
| Manufacturer | Pro-Ject Audio Systems |
| Color | Black |
| Output Power | 5 Watts |
| Number of Channels | 8 |
Note: Specifications are subject to change without notice.
Warranty and Support
Pro-Ject Audio Systems products are designed and manufactured with the highest quality standards. For warranty information and technical support, please refer to the warranty card included with your product or visit the official Pro-Ject Audio Systems website. Keep your proof of purchase for warranty claims.
Manufacturer: Pro-Ject Audio Systems
Model Number: BT BOX S2 HD - BLACK UNI
ASIN: B09GKGM3RB





