Douk Audio TONE Bluetooth Digital Power Amplifier

NOTICE

AUX and USB mode can only be switched and chosen when AUX and USB audio sources are input.
Headphone output and USB input have priority.
Please connect TONE to the power supply first, then plug into the socket. Otherwise, there may be sparks, but it is safe and will not harm the TONE.
The default power supply is 19V/3.42A. If you require higher output power, you can use a different 24V high-quality power supply with a 5.5mm / 2.1-2.5mm connector.

FEATURES

Supports RCA/AUX/USB/Bluetooth inputs and speaker/headphone outputs, compatible with various home audio systems.
Bluetooth 5.0 is compatible with various Bluetooth devices. It also functions as a USB sound card, supporting computers (no driver required) and phones (with OTG function) as input sources.
Provides Hi-Fi clear sound with no audible noise, even at high power output.
Offers strong power output up to 50W*2, capable of driving most home speakers.
Features a unique dual LED display on the mirror panel to clearly show the volume and add dynamism to the music.
Compact size and attractive appearance make it suitable for home and desktop use.

HOW TO USE

Connect the TONE to the power supply and then plug it into the socket. The left red LED on the front panel will illuminate.
Wired Input: Connect the appropriate audio input (USB / RCA / AUX) and output (speaker / headphone) cables according to your audio source and load. Long press the power button for 2 seconds to turn it on; the right LED will illuminate. Short press the VOLUME/MODE knob to select the desired audio input mode.
Wireless Input: Connect the TONE output to your speaker or headphone. Long press the power button for 2 seconds to turn it on; the right LED will illuminate. Short press the VOLUME/MODE knob to enter Bluetooth mode when the Bluetooth icon LED flashes. Search for the Bluetooth device named "Douk Audio TONE" on your audio device. Once successfully connected, the Bluetooth LED will remain constantly lit.
Adjust the volume by rotating the VOLUME knob. Pause/play music by short pressing the power button. A protective film is applied to the front panel and can be removed.

Front Panel Description

The front panel features:

Power button: Long press for 2 seconds to power on/off. Short press to play/pause music.
VOLUME/MODE knob: Rotate clockwise/anti-clockwise to adjust volume. The right red LED flashes when maximum/minimum volume is reached. Short press to select audio input mode (USB, AUX, RCA, Bluetooth).
Power indicator: Indicates power status.
Highlight lamp: Decorative lighting.
Power on/off indicator: Shows the device's power state.
Headset Output (3.5mm OUT): For connecting headphones (8Ω-300Ω).
AUX IN: Analog audio input.
USB IN: Digital audio input via USB.
Indicators: USB indicator, RCA indicator, AUX indicator, Bluetooth indicator.

Note: AUX/USB mode can only be switched and chosen when the corresponding audio source is connected.

The device is compatible with MP3 players, phones, tablet PCs, laptops, computers, projectors, and TVs.

Connections Diagram

The rear panel includes:

RCA IN: For connecting audio sources via RCA cables.
Speaker Outputs (Left and Right): Banana speaker jacks for connecting passive speakers (4Ω-8Ω).
DC IN: Power input port (DC 9V-24V). The default power supply is 19V/3.42A.

The diagram illustrates connections for speakers and the power supply.

KNOB AND BUTTON FUNCTIONS

Power button: Long press for 2S to power on/off. Short press to play/pause.
VOLUME/MODE knob: Rotate clockwise/anti-clockwise to adjust volume. The right red LED flashes at max/min volume. Short press to cycle through input modes (USB, AUX, RCA, Bluetooth).

PARAMETERS

Parameter	Specification
Bluetooth Version	5.0, 10-20M distance
Audio Inputs	RCA, 3.5mm AUX, Bluetooth, USB
Audio Outputs	Banana Speaker Jacks, 3.5mm headphone jack
Output Power	50W*2 (at 24V/4Ω load)
Speaker Impedance	4Ω-8Ω
Headphone Impedance	8Ω-300Ω
Frequency Response	20Hz-20KHz (±1dB)
SNR	≥98dB
Power Supply	DC9V-24V (with reverse polarity protection)
Dimensions	88 * 70 * 52 mm / 3.46 * 2.76 * 2.05 in
Net Weight	0.2 KG / 0.44lb
Package Weight	0.75 KG / 1.65lb

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