Douk Audio M1 Pro 320W Bluetooth 5.0 Power Amplifier 2.0 Channel Stereo Subwoofer Amp Music Player - DZ071

Product Overview

The Douk Audio M1 Pro amplifier delivers a maximum output power of 160W per channel when using the supplied 35V/5A power supply. This amplifier is compatible with a wide range of loudspeakers.

Features

• Utilizes the TDA7498E chip, providing a maximum output power of 160W per channel with a 35V/5A power supply.
• The M1 PRO supports stereo RCA and Bluetooth 5.0 input, ensuring compatibility with various devices such as phones, computers, TVs, MP3 players, and CD players.
• Functions as a digital music player with U-disk input, supporting MP3, WAV, APE, FLAC, and WMA formats.
• Features a low-frequency output for connecting active speakers, enabling enhanced bass.
• Designed with a concise circuit layout and wiring to ensure clear and clean HiFi sound with no audible noise, even at high power output.
• Compact size, durable aluminum alloy case, and gold-plated terminals ensure longevity.
• Includes an input switch and indicator for ease of use.

Bluetooth Reception

To receive Bluetooth signals, turn the toggle switch (No.1 on the front panel) to the 'BT' position. The Bluetooth name "BT HIFI AUDIO" will then be visible on your device (e.g., laptop), allowing you to connect.

Specifications

Packing List

Net Weight: 510g/1.12lb

Package Weight: 1.1Kg/2.43lb

• 1x M1 PRO Amplifier
• 1x Bluetooth antenna
• 1x 32V/5A Power supply
• 1x Instruction manual

The amplifier measures approximately 128mm/5.04in in length, 117mm/4.611in in width, and 35mm/1.38in in height.

Front and Rear Panels of the Amplifier

Front Panel Controls and Indicators

The front panel features several controls and indicators:

• Power/Input Switch (U-disk with priority): A toggle switch to select input source (USB/BT, RCA, OFF).
• PREV Button: Short press for previous song.
• P/M Button: Short press for Play/Pause. Long press to switch between Bluetooth and U-disk modes.
• NEXT Button: Short press for next song.
• USB/BT Input: USB port for U-disk input.
• BASS Knob: Adjusts bass level (increase clockwise, decrease counter-clockwise).
• TREBLE Knob: Adjusts treble level (increase clockwise, decrease counter-clockwise).
• VOLUME Knob: Adjusts overall volume (increase clockwise, decrease counter-clockwise).
• Red Power Indicator: Illuminates when the amplifier is powered on.
• Orange USB Indicator: Illuminates when U-disk input is active.
• Blue Bluetooth Indicator: Illuminates when Bluetooth input is active.

Rear Panel Interfaces

The rear panel provides various connection points:

• RCA Input (Left & Right): For audio input from devices like CD players, DAC decoders, mobile phones, or TVs. Red for right channel, white for left channel.
• SUB OUT: Bass channel output for connecting to an active subwoofer only.
• Speaker Output (Left & Right): For connecting passive speakers. Red terminals are positive (+), black terminals are negative (-). Supports banana plugs or bare wire connections.
• DC IN: Power input for the 19-35V DC power supply. This input MUST NOT exceed 35V.

RCA Connector: An RCA connector (also known as RCA Phono connector or Phono connector) is a common electrical connector for audio and video signals. The name originates from the Radio Corporation of America, which introduced the design in the 1930s. The term 'phono' in phono connector is an abbreviation for 'phonograph', as it was originally designed to connect phonograph turntables to radio receivers. RCA jacks are frequently used as phono inputs on the rear panels of preamps, mixers, or amplifiers, especially on older radio sets, for connecting phonographs or turntables.

Operational Steps

1. Ensure the VOL (Volume) button is set to MINIMUM.
2. Connect the speakers to the rear panel interface, paying attention to distinguish between positive and negative terminals.
3. Connect the desired sound source (Optional RCA/Bluetooth, U-disk).
4. If a U-disk is inserted while in the current playback state, the amplifier will automatically switch to U-disk mode.
5. Connect the power supply.
6. Press the power switch to turn the amplifier on.

Frequently Asked Questions

Q: All cables are connected, but there is no sound output?

A: Check if the POWER indicator is on. If not, press the POWER button. If the light is still off, try another DC power supply (minimum 12V) with the same output voltage to check if the original power supply has failed. If the POWER indicator is on, ensure the corresponding input signal is selected correctly. Also, check if the VOL knob is in the minimum position; if so, turn it clockwise to a normal volume. Finally, verify if the input device is paused, muted, or has its volume minimized.

Q: Why is the sound cracking?

A: This product can be used with a DAC decoder or as a preamplifier. If both the rear stage device and the front stage are set to maximum volume, distortion may occur. To resolve this, simply reduce the volume of the previous or subsequent stage.

Q: Why do the loudspeakers make a lot of electrical noise?

A: If you are not using the original power supply, replace it before further testing. Many third-party power supplies can produce significant interference, leading to current sound/noise.

Q: Why is the speaker noisy when the input cable is plugged in but no sound source is connected?

A: Using an unshielded signal line can allow interfering signals to enter the power amplifier. It is recommended to use a shielded signal cable or unplug the signal cable when not in use.

Q: Why does the amplifier stop working after a period of time, then work again after a period of silence?

A: The amplifier is likely overheating and has activated its protection mechanism. The output power may have exceeded the designed limit. It is best to lower the volume slightly and try again.

Q: Why does the amplifier's volume remain constant, while the sound from different audio sources (e.g., CDs, mobile phones) varies?

A: Different types of audio equipment have varying output frequency ranges. For example, a mobile phone typically outputs 0.35mV, while a CD player outputs 1V. The signal output frequency of the sound source directly influences the perceived volume.

Q: Why is the sound quality poor initially (e.g., high frequency not clear), but becomes normal after 8 hours of operation?

A: Speakers and amplifiers are sensitive devices that require a 'break-in' period. Sound quality typically improves after new amplifiers and speakers have been used for more than ten hours.