1. Introduction
Thank you for purchasing the WAPUNO AK170, AK270, or AK280 HiFi Audio Amplifier. These compact and powerful amplifiers are designed to deliver clear, strong, and high-quality sound for both home and car audio systems. Featuring a durable aluminum alloy body and intuitive controls, these amplifiers provide an excellent audio experience. Please read this manual thoroughly before use to ensure proper setup and operation.
2. Safety Information
- Ensure the amplifier is connected to a stable 12V DC power source.
- Do not expose the unit to water, moisture, or extreme temperatures.
- Avoid placing the amplifier in direct sunlight or near heat sources.
- Do not open the casing; there are no user-serviceable parts inside. Refer all servicing to qualified personnel.
- Ensure proper ventilation around the amplifier to prevent overheating.
- Connect speakers with an impedance of 4-8 ohms. Using speakers outside this range may damage the amplifier.
3. Package Contents
Please check the box for the following items:
- 1x WAPUNO HiFi Power Amplifier (AK170, AK270, or AK280 model)
- 1x User Manual
- 1x Power Supply (if purchased with the amplifier)
4. Product Overview
The WAPUNO amplifiers feature a robust aluminum alloy body and user-friendly controls. The front panel includes power, volume, bass, and treble adjustments, while the rear panel provides audio input and speaker output connections.
4.1 Front Panel Controls (AK-280 Example)
Image: Front panel of the AK-280 amplifier showing the Power Switch, Signal Input (AUX), Bass Control knob, Treble Control knob, and Total Volume Control knob.
- Power Switch: Toggles the amplifier on/off.
- Signal Input (AUX): 3.5mm jack for auxiliary audio input (AK270, AK280).
- Bass Control: Adjusts the low-frequency output (±10dB adjustment range).
- Treble Control: Adjusts the high-frequency output (±10dB adjustment range).
- Volume Control: Adjusts the overall output volume. Features a blue LED light for power indication and aesthetic appeal.
4.2 Rear Panel Connections (AK-280 Example)
Image: Rear panel of the AK-280 amplifier showing RCA input, Speaker output terminals, and DC 12V/5A power input. Also illustrates various devices that can be connected.
- Audio Input (RCA): Red and white RCA jacks for stereo audio input.
- Speaker Output: Terminals for connecting passive speakers (4-16Ω). Supports two main channels (Left and Right).
- Power Input (DC 12V/5A): Jack for connecting the 12V DC power adapter.
5. Setup Instructions
Follow these steps to set up your WAPUNO HiFi Audio Amplifier:
5.1 Connecting Speakers
- Ensure the amplifier is turned off and unplugged from the power source.
- Connect your passive speakers to the speaker output terminals on the rear panel. Ensure correct polarity (positive to positive, negative to negative) for each channel (Left and Right). The amplifier supports speakers with 4-8 ohm impedance.
Image: Rear panel of the AK-270 amplifier showing speaker connections and power input.
5.2 Connecting Audio Source
- For RCA input (AK170, AK280, and some AK270 models), connect your audio source (e.g., CD player, DVD player, computer) using an RCA cable to the 'AUDIO INPUT' jacks on the rear panel.
- For AUX input (AK270, AK280), connect your audio source (e.g., phone, MP3 player, tablet) using a 3.5mm audio cable to the 'AUX' jack on the front panel.
Image: Diagram showing various audio sources (MP3, Phone, Tablet PC, CD/DVD/Media players, TV/TV set top box, Laptop/Mac/Computer) connecting to the amplifier.
5.3 Connecting Power
- Connect the 12V DC power adapter (if included or purchased separately) to the 'POWER DC 12V/5A' input jack on the rear panel of the amplifier.
- Plug the power adapter into a suitable wall outlet.
Note: AK170, AK270, and AK280 models do NOT have Bluetooth functionality. Audio input is exclusively via AUX or RCA connections.
6. Operating Instructions
- Power On: Flip the 'POWER' switch to the 'ON' position. The blue LED light around the volume knob will illuminate (on models with this feature).
- Adjust Volume: Start with the 'VOLUME' knob set to minimum (MIN) to avoid sudden loud sounds. Gradually increase the volume to your desired listening level.
- Adjust Bass and Treble: Use the 'BASS' and 'TREBLE' knobs to fine-tune the audio output according to your preference. The adjustment range is ±10dB.
- Select Input (AK270/AK280): If your model has both AUX and RCA inputs, ensure your audio source is playing and the correct input is selected (if applicable, some models may automatically detect).
- Power Off: When finished, turn the 'VOLUME' knob to minimum, then flip the 'POWER' switch to the 'OFF' position.
Video: Demonstration of the AK-280 amplifier connected to speakers, showcasing its audio output.
7. Specifications
Below are the detailed specifications for the AK170, AK270, and AK280 amplifier models:
| Feature | AK-170 | AK-270 | AK-280 |
|---|---|---|---|
| Type | HiFi Power Amp | HiFi Power Amp | HiFi Power Amp |
| Channel | 2.0 | 2CH | 2.0 |
| Material | Aluminum Alloy | Aluminum Alloy | Aluminum Alloy |
| RMS Power | 20W + 20W | 20W x 2 | 40W + 40W |
| Max Power Per Channel | N/A | 200W (x2) | Above 200W |
| Rated Voltage | 12V/3A | DC 12V >3A | 12V/3A |
| SNR | 85dB | 85dB | 90dB |
| Resolution | 47K | N/A | 47K |
| Distortion Rate | 0.1 | <0.4% | 0.1 |
| Impedance | 4-8 Ω | 4-8Ω | 4-8 Ω |
| Rated Frequency | 20-20KHz | 20Hz-20KHz | 20-20KHz |
| Receiving Mode | RCA | AUX | RCA/Aux |
| Size (L x W x H) | 125 x 105 x 42mm | 12.5 x 10.5 x 4.2cm | 155 x 75 x 46mm |
7.1 Dimensions
Image: AK-170 dimensions (125x105x42mm).
Image: AK-270 dimensions (12.5x10.5x4.2cm).
Image: AK-280 dimensions (155x75x46mm).
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound output | Amplifier not powered on Volume too low Incorrect input selected Loose speaker connections Faulty audio source/cable | Ensure power switch is ON and LED is lit Increase volume knob Check input selection Verify speaker wire connections and polarity Test with a different audio source or cable |
| Distorted sound | Volume too high Incorrect impedance speakers Faulty audio source/cable | Reduce volume Ensure speakers are 4-8 ohms Test with a different audio source or cable |
| No blue LED light | No power Faulty unit | Check power adapter and wall outlet Contact customer support |
9. User Tips
- For optimal sound quality, ensure all audio cables are securely connected and of good quality.
- These amplifiers are suitable for various applications, including home stereo systems and car audio setups. They can be connected directly to a car's 12V power supply.
- Remember that these models (AK170, AK270, AK280) do not support Bluetooth. Use AUX or RCA for audio input.
10. Maintenance
- Cleaning: Use a soft, dry cloth to clean the amplifier's exterior. Do not use liquid cleaners or solvents.
- Storage: When not in use for extended periods, store the amplifier in a cool, dry place away from direct sunlight and extreme temperatures.
- Ventilation: Always ensure adequate airflow around the unit to prevent overheating. Do not block ventilation openings.
11. Warranty and Support
Your WAPUNO amplifier is covered by a standard manufacturer's warranty. For detailed warranty information or technical support, please refer to the documentation provided at the time of purchase or contact your retailer. Keep your purchase receipt as proof of purchase.
