1. Introduction
Welcome to the SANSUI F28 Dual Speaker Wireless Bluetooth Radio. This device is designed to provide a versatile audio experience, featuring FM radio, Bluetooth connectivity, and playback options from USB drives and TF cards. It also includes a recording function and a clear digital display for easy operation. This manual will guide you through the setup, operation, and maintenance of your new device.
Figure 1: SANSUI F28 with key features highlighted.
2. Package Contents
Please check the box for the following items:
- SANSUI F28 Radio Unit (Host)
- Type-C Charging Cable
Figure 2: Included accessories.
3. Key Features
- Dual Magnetic Horn: Equipped with high-quality, high-sensitivity 1.5-inch dual magnetic horns and a low-frequency passive enhancement unit for rich, clear sound.
- Multiple Playback Modes: Supports FM Radio, Bluetooth 5.0, U disk (USB drive) playback, TF card playback, and headset listening.
- Bluetooth 5.0 Connectivity: Offers a stronger signal and more stable transmission with an effective wireless range of up to 10 meters.
- HD Screen Display: A clear digital LCD screen displays various information in real-time, including song titles and lyrics (lyrics synchronization).
- Long Battery Life: Features a built-in 2200mAh removable lithium battery, providing approximately 8-10 hours of continuous listening on a full charge.
- Recording Function: Includes full-mode recording and a one-click deletion function.
- Digital Song Selection: Allows direct access to songs or radio stations using a numerical keypad.
- Portable Design: Lightweight (approx. 250g) and ergonomic with a lanyard for easy carrying.
Figure 3: Overview of the radio's capabilities.
Figure 4: Dual Magnetic Horns and Bass Enhancement Unit.
4. Technical Specifications
| Parameter | Specification |
|---|---|
| Model | F28 |
| Frequency Range | 70-108 MHz (FM Radio) / 100Hz-18KHz (Audio) |
| Horn Configuration | 1.5" Dual Magnetic Horn + Low Frequency Passive Enhancement Unit |
| Rated Power | 2 x 5W |
| PMPO | 225W |
| Bluetooth Version | 5.0 |
| Maximum Wireless Range | 10m-20m |
| Battery Capacity | 2200mAh (Removable Lithium Battery) |
| Input Power Supply | DC 5V / 1A (USB) |
| Voltage Range | USB (5-20V DC) |
| Body Size (L*W*H) | 128.8mm * 31.5mm * 68mm |
| Weight | Approx. 250g (Unit only) |
| Audio Crossover | Full-Range |
| Channels | 2 (2.0) |
| Material | Plastic (Cabinet, Sabwoofer) / Metal (Mid-range, Tweeter) |
| Control Type | Playback, Volume Control |
| Certification | CE |
Figure 5: Detailed technical specifications.
5. Setup Guide
5.1 Charging the Battery
- Locate the Type-C charging port on the side of the radio.
- Connect the provided Type-C charging cable to the radio and a compatible USB power adapter (DC 5V/1A, not included).
- The charging indicator on the display will show the charging status.
- A full charge typically takes about 8-10 hours.
Figure 6: Charging the device.
5.2 Power On/Off
- To power on, press and hold the power button (usually marked with a circle and a vertical line) until the display lights up.
- To power off, press and hold the power button again until the display turns off.
6. Operating Instructions
6.1 Mode Selection
Use the 'M' button or dedicated mode buttons to switch between different playback modes: FM Radio, Bluetooth, U disk, TF card, and Headset.
6.2 FM Radio Operation
- Extend the telescopic antenna for better reception.
- Switch to FM Radio mode.
- Use the tuning knob or number buttons to select a radio station. For direct frequency input, use the numerical keypad. For example, to tune to 74.8 MHz, input '7', '4', '8'.
Figure 7: Extending the antenna for FM radio.
Figure 8: Direct frequency/song selection.
6.3 Bluetooth Playback
- Switch the radio to Bluetooth mode. The display will indicate Bluetooth pairing mode.
- On your mobile device, enable Bluetooth and search for available devices.
- Select "SANSUI F28" from the list to pair.
- Once paired, you can play audio from your device through the radio.
Figure 9: Bluetooth connection with a smartphone.
6.4 USB Disk Playback
- Insert a USB flash drive containing audio files into the USB port on the radio.
- The radio will automatically switch to U disk playback mode or you may need to select it manually.
- Use the playback controls (play/pause, next/previous) to manage your music.
Figure 10: USB disk playback.
6.5 TF Card Playback
- Insert a TF (MicroSD) card containing audio files into the TF card slot.
- The radio will automatically switch to TF card playback mode or you may need to select it manually.
- Use the playback controls to manage your music.
Figure 11: TF card playback.
6.6 Headset Listening
- Plug your 3.5mm wired headphones into the headphone jack on the side of the radio.
- The audio will automatically switch from the speakers to the headphones.
Figure 12: Headset connection.
6.7 Recording Function
In USB disk or TF card music playback mode, long-press the dedicated recording button to start recording. In the recording process, press the button again to end the recording. Short-press the button to play the recorded file.
Figure 13: One-click recording.
6.8 Song Synchronization and Display
The HD screen displays song titles and lyrics in real-time, making it easy to follow along with your music.
Figure 14: Song synchronization display.
6.9 Volume Control
Adjust the volume using the dedicated volume knob, typically located on the side or top of the device.
Figure 15: Volume knob and controls.
Video 1: SANSUI F28 Product Demonstration.
7. Maintenance and Care
- Cleaning: Use a soft, dry cloth to clean the exterior of the radio. Do not use liquid cleaners or abrasive materials.
- Storage: Store the radio in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Care: To prolong battery life, avoid fully discharging the battery frequently. Charge the device regularly, even if not in use for extended periods.
- Antenna: Handle the telescopic antenna gently to prevent bending or breaking.
8. Troubleshooting
| Problem | Possible Solution |
|---|---|
| No power / Device won't turn on | Ensure the battery is charged. Connect the Type-C cable and charge for several hours. Try pressing and holding the power button for a few seconds. |
| Poor FM radio reception | Fully extend the telescopic antenna. Move the radio to a location with better signal. Avoid strong electromagnetic interference. |
| Bluetooth pairing fails | Ensure the radio is in Bluetooth mode and discoverable. Turn off and on Bluetooth on your mobile device. Make sure the devices are within 10 meters. |
| USB/TF card not playing | Ensure the USB drive or TF card is inserted correctly. Check that the audio files are in a compatible format. Try a different USB drive or TF card. |
| No sound from speakers/headphones | Check the volume level. Ensure headphones are fully plugged in if using them. If using headphones, unplug them to check speakers. |
9. User Tips
- Explore All Modes: Take time to experiment with all the playback modes (FM, Bluetooth, USB, TF card) to discover your preferred listening method.
- Direct Access: Utilize the numerical keypad for quick access to specific FM frequencies or song tracks on your USB/TF card.
- Portable Use: The lanyard design makes it convenient for outdoor activities. Remember to extend the antenna for better radio reception when outdoors.
Figure 16: Portable design with lanyard for travel.
10. Warranty and Support
Your SANSUI F28 radio comes with a standard manufacturer's warranty. Please refer to the warranty card included in your package for specific terms and conditions. For technical support, troubleshooting assistance, or warranty claims, please contact the retailer or manufacturer's customer service department.