This document describes the Sunbuck AS60BU Stereo Digital Power Amplifier, a wireless BT stereo digital power amplifier designed for both domestic and commercial use.

Function Description

The AS60BU is a compact Class D digital amplifier capable of delivering a powerful 55W (PMPO 300W) maximum output per channel. It features multiple input options and controls, making it a versatile audio solution.

Key functions include:

Amplification: Boosts audio signals for output through speakers.
Wireless Audio Streaming: Integrated Bluetooth receiver allows for wireless connection to compatible devices.
Media Playback: Built-in media player supports USB flash drives and Micro SD cards.
FM Radio: Includes an FM receiver for radio playback.
Karaoke Functionality: Two microphone inputs with adjustable volume, tone, and echo controls.
Audio Input Selection: Multiple wired inputs for various audio sources.

Important Technical Specifications

Power Supply:

100-240Vac, 50/60Hz (IEC)

Output Impedance:

4 - 8Ω

Output Power:

8Ω: 2 x 35W RMS / 2 x 40W max. (EIAJ Standard @ 1kHz 10% THD)
4Ω: 2 x 45W RMS / 2 x 55W max. (EIAJ Standard @ 1kHz 10% THD)

Frequency Response:

20Hz-20KHz

SNR (Signal to Noise Ratio):

92dB

Input Sensitivity:

Line: 180-450mV
Mic: 18mV

Dimensions:

220 x 200 x 68mm

Weight:

1.1kg

Usage Features

The AS60BU amplifier offers a range of features for flexible audio management:

Inputs:

Wireless: Bluetooth for audio streaming.
Media Player: USB Plug and Micro SD Plug for direct media playback.
Analog Audio:
- RCA (L/R) Audio Input (CD Input, LINE Input).
- Extra AUX input (3.5mm jack) for other sound inputs like car audio.
Microphone: Two MIC inputs (MIC 1, MIC 2) with individual volume, tone, and echo controls.
FM Antenna Input: For radio reception.
12DC Power Input: (Specific use case not detailed, but available).

Controls (Front Panel):

Power Switch: ON/OFF.
Media Player Controls: Display screen, MP3 button, MODE, CH-/+, Play/Pause.
Master Volume: Large knob for overall volume control.
Tone Controls: BASS and TREBLE adjustment knobs for music listening.
Microphone Controls: ECHO, TONE, and MIC VOLUME knobs.
Signal Exchange Knob: For selecting input sources.

Controls (Remote Control):

ON/OFF: Media Player Switch.
MODE: Mode exchange, player input channel choose.
STOP: Resets playback to the first song on USB/SD.
MUTE: Turns multimedia signal on/off.
VOL+/VOL-: Volume adjustment.
CH-/CH+:
- Short press: Last/next song (USB/micro SD/Bluetooth), last/next FM station.
- Long press: Quick backwards/forwards (USB/micro SD/Bluetooth), quick backwards/forwards search (FM stations).
Play/pause:
- Short press: Pause/resume playback (USB/micro SD).
- Bluetooth mode: Pause/resume play.
- Long press: Bluetooth mode exit connection.
REPE: Repeat mode switch.
EQ: EQ mode switch (NORMAL, POP, CLASSICAL, ROCK, JAZZ).
0-9: Number Key for direct track selection.

Speaker Connection:

Supports 4-8Ω impedance output.
Speakers can be wired in parallel or series.
Right and Left speaker outputs.

Installation Guidelines:

Ensure power is switched off and mains unplugged before installation.
Wire speakers to the amplifier, ensuring correct positive and negative terminals.
Audio input on the back is through 3 pairs of RCA connectors; ensure left and right signals are correct for stereo output.
Insert the IEC plug and connect the unit to the mains.
Before switching on, set master volume to the lowest point to avoid power surge damage.
Adjust volume to an appropriate listening level.

Maintenance Features

Safety Information:

Caution: Do not open the device; no user-serviceable parts inside. Risk of electric shock.
Exposure: Do not expose to rain or moisture.
Electric Shock Prevention: Non-professionals should not open the shell cover. If repair is needed, qualified service personnel should be consulted.
High Pressure Machine Memory: Non-electronic professionals should not disassemble the case due to potential serious electric shock from internal electronic components.
Power: Use only the specified power type.
Shock Prevention: Prevent water or metal from entering the machine to avoid internal short-circuits.
Safety Ground Wire: The product is grounded through the power cord grounding conductor for personal safety; ensure reliable grounding.

Troubleshooting Guide: The manual provides a comprehensive troubleshooting section for common issues:

No Power:
- Check mains switch, power lead condition and insertion.
- Check IEC plug insertion on amplifier.
- Check amplifier power switch.
- Check if the fuse is faulty; if frequent blowing occurs, stop use and refer to qualified personnel.
No Music Output:
- Check input connection leads on both amplifier and source.
- Verify correct input selection.
- Ensure audio source is playing.
- Check volume levels on both amplifier and audio source.
- Inspect speaker cable for damage, proper stripping, and connection.
- Check for loose strands of speaker cable touching positive and negative terminals, which can trigger short circuit protection.
No Mic Output:
- Check if Mic is switched on.
- Check Mic volume on the amplifier.
- Verify if Mic requires phantom power (if applicable).
- Test Mic functionality on another device.
Diminishing Output:
- Check speaker polarity connection.
- Ensure audio source volume is turned up.
- Verify speaker impedance is within the specified range.
Disrupted Output:
- Ensure output volume is not too high on both audio source and amplifier.
- Check for damage on speaker cable and connection leads.
- Ensure amplifier, audio device, speaker, and connection cables are not near mains power cables or large inductive appliances (e.g., fridge).

Environmental Disposal:

This product is classified as Electrical or Electronic equipment.
Should not be disposed of with other household or commercial waste at the end of its life.
Must be disposed of according to local council guidelines.

FCC Statement:

Complies with Class B digital device limits (Part 15 of FCC Rules).
Generates, uses, and can radiate radio frequency energy.
If interference occurs, users are advised to reorient/relocate receiving antenna, increase separation, connect to a different circuit, or consult a technician.
Changes/modifications not approved by manufacturer could void authority to operate.
Operation is subject to two conditions: no harmful interference, and acceptance of any received interference.
Evaluated for general RF exposure and can be used in portable exposure conditions without restriction.

Sunbuck AS60BU - Page 8

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