Introduction
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M5.1 front & back panel
Operation steps
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① Input mode indicator
② 2.1 channel output indicator
③ 5.1 Channel output indicator
④ On/off/switch channel
(short press:on/switch channel,
long press: turn off)
⑤ Previous song
⑥ Short press: pause/play,
long press: switch between
2.1/5.1output modes
⑦ Next song
⑧ Subwoofer volume knob
⑨ Center volume knob
⑩ Surround volume knob
⑪ Front volume knob
⑫ Main volume knob
⑬ Bass knob
⑭ Treble knob
⑮ U-disk input
⑯ Coaxial input
⑰ Bluetooth antenna base
⑱ Optical input
⑲ Low-frequency output
(connect to active subwoofer)
⑳ RCA input(White:left channel,
red:right channel)
㉑ 5.1 Front left/right audio input
㉒ 5.1 Surround left/right audio input
㉓ Subwoofer audio input
㉔ Central audio input
㉕ Auxiliary power interface
(used as power compensation)
㉖ Main power interface (DC 15-24V)
㉗ 2.1 Left/right speaker interface/
5.1 front left/right speaker interface
㉘ 5.1 Surround left/right speaker
interface
㉙ 5.1 Center speaker interface
㉚ Subwoofer output
㉛ 5.1 Speaker interface
Q: Why are all cables connected but there is no sound?
A: 1. Check the channel indicator light of M5.1:
① If it can light up normally, please check if the corresponding input
mode is selected.
② If it cannot light up, please use another 15-24V power supply to
detect whether the fault is the power supply or M5.1.
2. If the indicator light is on but there is no sound, so the power supply is
normal. Please continue to check according to the order of audio
signal transmission: audio source → audio cable → preamp/decoder→
amplifier → speaker.
3. If all is fine, please check whether the audio source is muted,
paused or the volume is too small.
Q: Why is the sound distorted? How to adjust the treble, bass and main
volume?
A: Maybe the input amplitude is too large. If the volume of audio source
and M5.1 both are turned to maximum, it is easy to cause distortion.
Please turn down the main volume of audio source or M5.1. In general,
adjust the volume of amplifier to about 60%, then fine-tune the volume
of preamp (distortion will be greatly reduced in this way); the treble and
bass are usually adjusted according to the music style/device types/
personal preference.
Q: Why does the volume of different audio sources(such as changing CD
player to phone) differ when the volume of M5.1 is unchanged?
A: Different audio devices can output different signal amplitudes, for
example, the phone usually is 0.35V, while CD player is 1V.
Q: Why is there a loud current sound or buzzing sound on the speaker?
A: 1. Please use the original power supply. Many power supplies in the
market have interference, which will cause current sound.
2. When using unshielded signal cable in no load, there will be
interface signals. Please use the shielded signal cable or unplug it.
3. If there is still noise after eliminating above situations, please confirm
whether it is external noise or internal noise. Disconnect all inputs
and only retain power supply and power cable. If the noise
disappears, it is from audio input; if the noise is still there, it is possibly
caused by the power supply or the internal of M5.1.
Q: Why there is no sound or very little sound after the amplifier is
connected to the speaker?
A: 1. Please check the audio source has been turned on and the volume
is not at the minimum.
2. Please confirm whether the speaker and amplifier match ( For
example, the speaker is fixed resistance or fixed voltage, the power
of speaker is too much over the power of the amplifier etc).
Q: What are the reasons for the unbalanced left and right volume of the
speakers and how to eliminate them?
A: Please check audio source, input cable, volume potentiometer (some
amplifiers have balanced control or separate volume control of left
and right channel ), speaker cable, speakers (whether the position and
the distance is symmetrical) and other factors.
Q: Why Bluetooth cannot be searched? How to switch to Bluetooth mode?
A: Press the power button to switch to BT mode, there will be blue light
flashing, then use your phone or tablet to search and click to connect it,
then play music.
(The Bluetooth name may different in different models of products).
Q: Why does the Bluetooth playback lag or even disconnect?
Why is the Bluetooth background noise/current noise obvious?
A: Please check whether the Bluetooth antenna is installed correctly,
whether there is interference or blocking (such as WiFi router / wireless
telephone / FM radio, etc., since they may be in the same frequency
band as Bluetooth, and inductive loads such as fans/refrigerators/air
conditioners will also cause some interference), whether the Bluetooth
is blocked or too far away from the device (more than 15 meters).
Q: Can M5.1 be connected to my computer via Bluetooth?
Why is there no sound when connected to PC?
A: Compared with phones, computers with poor compatibility and
troublesome operations when using Bluetooth. Need the computer
with Bluetooth function and to update the driver and set the output
device to Bluetooth after connection.
Q: Why is there no music output after inserting a U-disk?
A: Please confirm the format and capacity of the U-disk, as well as the file
format of the U-disk (only supports U-disk in FAT32 format within 64G).
Q: Why is U-disk playback sometimes laggy?
A: In general, MP3/FLAC/APE/WMA/WAV and other common formats are
supported, please confirm the file format of the U-disk. (Please put the
music files under root directory, don't create a new folder or don't play
other unsupported files, or else there may be an error).
Q: Why is there a thumping sound when switching on/off?
A: Please confirm the on-off sequence is correct, normally it follows the
order of signal transmission when turn on: audio source → preamp /
DAC → amplifier → speaker. (The sequence is reversed when switching
off. As the internal capacitors will be discharged for a while after
shutdown. If turn off the preamp firstly and then turn off amplifier,
impact sound will be easily caused which may damage the amplifier
or speaker in severe cases).
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FAQ
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1. Connect the 24V/4.5A power adapter to the main power interface of M5.1.
2. ① 2.1 channel output: connect the passive speaker to the front and
subwoofer output of M5.1.
② 5.1 channel output: connect the passive speaker to the front /
surrounded / center / subwoofer outputs of M5.1. Also with a
low-frequency output can connect to an active subwoofer.
3. Bluetooth input
Short press power button and switch to Bluetooth input mode (There will
be blue indicator flashing.), Turn on Bluetooth on your phone, search and
click to connect, the blue indicator will be steady blue after successful
connection.
4. U-disk/Coaxial/Optical/RCA input
● U-disk input: Insert the U-disk to the USB interface of M5.1, and then
short press power button to power on and switch to USB input, the red
indicator will be on.
● Coaxial input: Connect the audio source to the coaxial interface of
M5.1 via coaxial cable, and then short press power button to power on
and switch to coaxial input, the “COAX/OPT” indicator will light on blue.
● Optical input: Connect the audio source to the optical interface of M5.1
via optical cable, and then short press power button to power on and
switch to optical input, the “COAX/OPT” indicator will light on red.
● 2.1 channel input: If you only want 2.1 channel audio input, connect
audio source to the 2.0 channel RCA interface(⑳) of M5.1 via RCA
cable, and then short press the power button to power on and switch to
2.0 channel RCA input mode.
● 5.1 channel input: If you want 5.1 channel audio input, connect audio
source to the 5.1 channel RCA interface(㉑㉒㉓㉔) of M5.1 via RCA cable,
and then short press the power button to power on and switch to 5.1
channel input mode.
After selecting the audio input mode, please long press the play/pause
button to switch to 2.1 or 5.1 channel output mode.
5. Play music on your audio source devices, and then you will hear HiFi music
from the speakers, then you can rotate the knobs to adjust the main /
sub / center / surrounded / front volume, and adjust the treble and bass
knob to get more delicate sound.
6. After listening, please long press the power button to shut it down, then
disconnect the power adapter.
Parameters
MANUAL
1. Please do not open the shell by yourself, improper operation may cause
a risk of electric shock.
2. Please use the regular manufacturer's switching power supply, otherwise
there will be the risk of damage to M5.1.
3. Please do not use M5.1 in a high temperature or humidity environment.
4. Default with one 24V/4.5A power supply, can satisfy the needs of most
home speakers. If you want higher output, please prepare another one
by yourself.
5. RCA indicator means 2.0 channel input, and 5.1 indicator means 5.1
channel input. When switching to 5.1 channel input mode, the 6 input
signals and 6 output speakers should correspond to each one.
6. Long press play/pause button can switch to 2.1 or 5.1 channel output
mode. When switching to 5.1 channel output mode, any input modes
can achieve 5.1 channel output.
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Website: www.doukaudio.com
Email: nobsound@doukaudio.com
WeChat/Whatsapp: +86-17704028602
Address: Room 1329, Wang Cheng Building, Long Guan East Road,
Long Hua District, Shen Zhen, Guang Dong, China, 518000
Contact information
Warning
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Audio input
Audio output
Maximum output power
(@4Ω 24V/≥4.5A)
Frequency response
Bass frequency response
Input sensitivity
SNR
THD
Treble&Bass range
Working voltage
Max. supported storage of U-disk
Supported formats of U-disk
Package weight
Package dimensions(W*D*H)
Bluetooth 5.0 / Coaxial /
Optical / U-disk / 2.0 Channel
RCA / 5.1 Channel RCA
5.1 channel banana speaker
jacks / Low frequency out
(connect to active subwoofer)
Front main channel: 50W+50W
Surrounded channel: 50W+50W
Center channel: 50W
Bass channel: 50W
20Hz-20KHz（±1.5dB）
40Hz-160Hz
0.775V
≥100dB
0.05% @1kHz
±6dB
DC 15-24V
64G
MP3 / WAV / WMA / APE / FLAC
U-disk: 16Bit / 44.1-48KHz
Bluetooth: 16Bit / 44.1-48KHz
Coaxial: 16-24Bit / 44.1-192KHz
Optical: 16-24Bit / 44.1-192KHz
1.8kg / 3.97lb
410*205*83mm / 16.14*8.07*3.27in
Supported sampling rate
