DOUK AUDIO M8 Bluetooth 5.0 Valve Tube Power Amplifier Instruction Manual

DOUK AUDIO M8 Bluetooth 5.0 Valve Tube Power Amplifier

Product Information

Specifications:

• Audio input : Bluetooth / stereo RCA / 3.5mm AUX
• Audio output: banana speaker jacks
• Amplifier Chip : TPA3116
• Rated output powe r: 30W+30W@8Ω / 50W+50W@4Ω
• Matched speaker impedance : 4-8Ω
• Frequency response : 20Hz-20KHz
• Signal to noise ratio: >99dB
• THD+N:

Product Usage Instructions

Step 1: Audio Input Connection
To use the amplifier, you need to connect an audio source to it. You can choose from three options:

1. Bluetooth: Pair your Bluetooth-enabled device (such as a smartphone or tablet) with the amplifier by following the Bluetooth pairing instructions in your device’s user manual.
2. Stereo RCA: Use an RCA cable to connect the audio output of your device (such as a CD player or TV) to the RCA input on the amplifier.
3. 3.5mm AUX: Use a 3.5mm AUX cable to connect the headphone jack of your device (such as a smartphone or laptop) to the AUX input on the amplifier.

Step 2: Audio Output Connection
To listen to the amplified audio, you need to connect speakers to the amplifier. The amplifier has banana speaker jacks for easy speaker connection.

1. Identify the positive (+) and negative (-) terminals on your speakers.
2. Insert the bare wire ends of your speaker cables into the corresponding banana plugs on the amplifier. Make sure to match the positive and negative terminals correctly.

Step 3: Power On and Volume Control
Once the audio input and output connections are made, follow these steps to use the amplifier:

1. Make sure the power switch on the amplifier is in the “Off” position.
2. Connect the amplifier to a power source using the provided power cable.
3. Turn on the power switch and wait for the amplifier to initialize.
4. Adjust the volume control knob to your desired listening level.

Frequently Asked Questions (FAQ)

Q: What can cause static noise when using the amplifier?
A: There are several potential causes for static noise:

• A low-quality audio cable can introduce static noise.
• If the sound source itself has noise, the amplifier will amplify it along with the audio signal.
• Check if the tubes are properly plugged into the tube sockets. Loose connections can result in static noise.
• Other devices like routers or mobile phones can interfere with the audio signal and introduce static noise.

Bluetooth 5.0 Tube Amplifier 50W×2

Warm Tips

1. There is a large probability that the low-quality audio cable causes the static noise.
2. Please make sure the sound source is fine since tube amplifiers will amplify all sound including the noise.
3. Please check whether the tubes are plugged well on the tube sockets or not.
4. Devices like routers, mobile phones will also interfere in the audio signal and and may cause static noise.

How to use

1. Connect passive speakers to the output of M8.

2. Wired input
   Connect the audio device to the RCA or 3.5mm AUX input of M8. Please toggle the input switch to AUX position, and then toggle the other input switch to AUX-1(AUX input) or AUX-2(RCA input).

3. Wireless input Please toggle the input switch to BT position. Turn on Bluetooth on your phone, search and click to connect.

4. Connect power adapter to M8 first and then plug the power cable into the socket, and then press the power button to power on.

5. Adjust the volume, treble or bass according to your listening preference.

6. After use, please press the power button to power off first, and then disconnect the power adapter.

Parameters

• Audio input: Bluetooth / stereo RCA / 3.5mm AUX
• Audio output : banana speaker jacks
• Amplifier Chip : TPA3116
• Rated output power: 30W+30W@8Ω / 50W+50W@4Ω
• Matched speaker impedance : 4Ω-8Ω
• Frequency response: 20Hz-20KHz
• Signal to noise ratio: >99dB
• THD+N: <1%
• Working voltage: DC 19V (5.5mm/2.5mm)
• Dimensions(WDH): 11513233mm / 4.535.201.30in
• Net weight: 515g / 1.14lb
• Package weight: 1.1kg / 2.43lb

Packing List

• 1*M8 Amplifier
• 2*6K4 Tube
• 1*19V Power Supply
• 1*Bluetooth Antenna

Contact information

• Address: Room 1329, Wang Cheng Building, Long Guan street, Long Hua new District, Shenzhen, Guang Dong, China
• Contact: LIU CHENXI
• Tel: +86-177-0402-8602
• Email: nobsound@doukaudio.com

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