Woopker AK55 HiFi Stereo Audio Amplifier User Manual

Important Safety Instructions

WARNING! CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE THE COVER OF THIS UNIT. THERE ARE NO USER SERVICEABLE PARTS INSIDE. REFER ALL SERVICING TO A QUALIFIED TECHNICIAN.

1. Read these instructions thoroughly before using this item.
2. Keep these instructions for future reference.
3. Heed all warnings.
4. Follow all instructions.
5. WARNING: To prevent fire or electric shock, do not expose this equipment to rain or moisture. Do not store or operate this product near any liquids.
6. Clean only with a dry cloth.
7. Do not store or operate this product near any heat sources such as radiators, heat registers, stoves, or other apparatuses (including amplifiers) that produce heat.
8. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding plug has two blades and a round grounding prong. The wide blade or third prong is provided for your safety. If the provided plug does not fit your outlet, consult an electrician for the replacement of the obsolete outlet.
9. Protect all wires connected to this unit from being walked on or pinched, particularly plugs and the point where they exit from the unit. When removing the cord from the power outlet, remove it by holding the plug not by pulling the cord.
10. Unplug the unit during lightning storms or when unused for long periods of time.
11. When wiring this unit and all other equipment used in connection to this unit make sure that all of your equipment is turned OFF.
12. Once installation and wiring is complete power on all your equipment with the volume and level controls turned DOWN. Once all the equipment is ON slowly raise the volume or level controls to their proper positions.
13. When grounding this unit, be sure to do so correctly, so as not to defeat the built-in grounding in this unit.
14. Before placing, installing, rigging, or suspending any product, inspect all hardware, suspension, cabinets, transducers, brackets and associated equipment for damage. Any missing, corroded, deformed, or non-load rated component could significantly reduce the strength of the installation, placement or array. Any such condition severely reduces the safety of the installation and should be corrected. Use only hardware which is rated for the loading conditions of the installation and any possible short-term, unexpected overloading. Never exceed the rating of the hardware or equipment.
15. Consult a licensed, professional engineer regarding physical equipment installation. Ensure that all local, state and national regulations regarding the safety and operation of equipment are understood and adhered to.
16. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

Product Overview

The Woopker AK55 is a mini HIFI digital Bluetooth audio power amplifier designed for home audio systems and various applications. It features multiple audio input options, including AUX, U disk, MP3 format play, and Bluetooth wireless connectivity. The amplifier also supports FM stereo radio and offers comprehensive control over treble, bass, and volume. Its low distortion design ensures a clear, strong, and powerful sound output.

Package Contents

Ensure all items are present in the package:

• 1x Power Amplifier (AK55)
• 1x Remote Control
• 1x Power Cable
• 1x Antenna
• 1x English Manual

Note: The battery for the remote control is not included. Please purchase 2xAAA batteries separately.

Setup Instructions

Front Panel Controls

1. POWER: ON/OFF switch for the unit.
2. BASS: Bass control knob.
3. TREBLE: Treble control knob.
4. AUX: 3.5mm Audio Source Input.
5. MIC.VOL: Microphone volume control.
6. MIC1/MIC2: Microphone 1/2 input jacks.
7. ECHO: Microphone reverb volume adjustment.
8. DELAY: Microphone DELAY adjustment.
9. VOLUME: Master volume adjustment knob.
10. MP3/USB Port: USB card slot for MP3 playback.
11. Digital Display: Shows current mode and track information.
12. Music Control Buttons: Last/Vol-, Scan, Vol+, Mode.
13. BT.C Audio: Bluetooth audio indicator.

Rear Panel Connections

13. FM ANT: FM antenna connection.
14. OPT/COA Input: Fiber Coaxial/Optical signal input.
15. AC 110V/240V: AC power input (auto-switching).
16. DC 12V/5A: DC power input.
17. Audio Input (AUX1/AUX2): RCA audio input interfaces.
18. Speaker System 4Ω-16Ω: Left and Right channel speaker outputs.

Speaker Connection

Proper speaker connection is crucial for optimal sound quality and to prevent damage to the amplifier and speakers.

1. Distinguish Polarity: Before connecting, identify the positive (usually red) and negative (usually black) poles of your speakers.
2. Match Impedance and Power: The speakers' impedance should be 4-16 ohms. The power of the speakers should not be less than the amplifier's power (70W per channel). Connecting speakers with lower power than the amplifier can cause them to burn out if played loudly.
3. Speaker Type: This amplifier is a low-resistance (constant resistance) power amplifier, suitable for 4-16 ohm paper-basin speakers. Do not connect constant pressure ceiling speakers or constant pressure broadcast speakers.
4. Prepare Speaker Wires: Peel off about 1cm of plastic insulation from the speaker wires. Twist the exposed copper wire tightly.
5. Connect Wires to Amplifier:

   

   • Press down the clamp on the back of the speaker or the amplifier's speaker terminals (red for positive, black for negative).
   • Insert the stripped copper wire into the corresponding hole.
   • Ensure positive and negative polarities are not reversed.
   • Make sure the exposed copper parts of the speaker line do not touch each other, as this can cause machine protection or burning.
6. Two-Channel Amplifier: This is a two-channel amplifier. Only two speakers are allowed to be connected. Do not add more than one set of speakers in parallel, as this increases the load and can damage the machine.
7. Speaker Wire Length: The connection line of the speaker should not be less than 0.3 square meters and its length should not exceed 10 meters. For normal use, control the length within 5 meters as much as possible. Use high-quality special connection wire for best results.

Operating Instructions

Remote Control Functions

1. Power Button: Turns the MP3 function ON or OFF.
2. MODE Button: Selects the playing mode (USB/SD/FM/BLUETOOTH).
3. MUTE Button: Mutes the music.
4. EQ Button: Selects a preset sound effect.
5. Play/Pause Button: Plays or pauses in USB or Bluetooth mode. In FM mode, press once to auto-scan frequencies (88.1MHz to 107.9MHz) and store channels.
6. VOL+ Button: Increases the volume.
7. Previous Track/Station Button: Selects the previous track in AUX/USB/BLUETOOTH mode or previous channel in FM mode. Holding for >3 seconds in FM/BLUETOOTH mode decreases volume.
8. Next Track/Station Button: Selects the next track in AUX/USB/BLUETOOTH mode or next channel in FM mode. Holding for >3 seconds in FM/BLUETOOTH mode increases volume.
9. SCN (Scan) Button: In FM mode, press for auto scanning.
10. VOL- Button: Decreases the volume.
11. Number Buttons (0-9): Selects tracks directly (1-2 second response in USB or SD mode).
12. RPT (Repeat) Button: Toggles single or all tracks repeat function.

Bluetooth Connectivity

The AK55 amplifier features simple and hassle-free Bluetooth pairing, compatible with smartphones, tablets, laptops, and other devices.

1. Press the MODE button on the amplifier or remote control to select Bluetooth mode. "BLUETOOTH" will be displayed on the screen.
2. On your Bluetooth device (smartphone, tablet, etc.), search for available Bluetooth devices.
3. Locate and select the Bluetooth network name "BT".
4. Wait for your device to pair with the amplifier.
5. The unit will emit a sound confirming successful pairing.
6. Once paired, you can play music from your Bluetooth device, using either your device's controls or the amplifier's control buttons to select tracks.

Note: The amplifier must be switched to Bluetooth mode to successfully connect. If not, your device may find "BT" but fail to connect.

Maintenance

• Cleaning: Clean the unit only with a dry cloth. Do not use liquid cleaners or aerosol cleaners.
• Storage: Store the product in a cool, dry place away from direct sunlight and heat sources.
• Power: Unplug the unit during lightning storms or when unused for long periods to prevent damage.
• Servicing: Refer all servicing to qualified service personnel. Do not attempt to open the unit or perform repairs yourself.

Troubleshooting

• No Sound or Poor Sound Quality:
  • Ensure all wiring is correct and secure. Check speaker connections for proper polarity (red to red, black to black) and ensure no exposed copper wires are touching.
  • Verify that the speaker impedance is within the 4-16 ohms range and that speaker power matches or exceeds the amplifier's 70W per channel.
  • If the sound is smaller or lacks bass, check if the speaker polarity is inversely connected.
  • If there is a click or intermittent sound, check if speaker connection posts are tightened and if speaker wires are overlapped.
  • Ensure the volume and level controls are not turned down.
• Bluetooth Connection Issues:
  • Make sure the amplifier is switched to Bluetooth mode (display shows "BLUETOOTH") before attempting to pair your device.
  • Ensure your Bluetooth device is within range and its Bluetooth function is enabled.
• FM Radio Performance:
  • The AK55 is not a professional FM radio. Do not expect high-end radio performance. Ensure the FM antenna is properly connected.
• Distortion at High Volume:
  • If the speaker is too loud and produces distortion, it indicates excessive power usage. Adjust the main volume control of the device downwards to match the device and speakers perfectly.
• Power Issues:
  • If using DC power, ensure you are using a 12V/5A adapter. Only one power method (AC or DC) can be used at any time.

Technical Specifications

User Tips

• For optimal audio performance, ensure that the rated power of each connected speaker does not exceed 70W.
• When using DC power, always use a 12V/5A adapter. Remember that only one power method (AC or DC) should be connected at any given time.
• If you experience issues with Bluetooth connectivity, double-check that the amplifier's mode is explicitly set to Bluetooth. Your device might detect the amplifier but fail to connect if the mode is incorrect.
• While the amplifier includes an FM radio function, it is not designed for professional-grade reception. Manage expectations regarding FM radio performance.

Support and Warranty Information

For any issues or servicing needs, please refer to qualified service personnel. Do not attempt to repair the unit yourself.

When purchasing this product, please keep your purchase information (receipt, date of purchase, name of sales unit). The product is typically covered by a warranty for one year from the date of purchase. In case of failure, please report back to the dealer in time for assistance and after-sales warranty service.

Warranty may not cover damages caused by natural disasters (such as earthquakes, flash floods, fires) or man-made damage.

A detailed warranty record template is available in the full user manual PDF: Woopker AK55 User Manual (PDF).