📘 Douk Audio manuals • Free online PDFs

Douk Audio Manuals & User Guides

Douk Audio, often known as Nobsound, manufactures affordable Hi-Fi audio components including vacuum tube amplifiers, DACs, preamps, and spectrum visualizers for desktop and home audio setups.

Tip: include the full model number printed on your Douk Audio label for the best match.

Douk Audio Support

Official site: https://doukaudio.com
General support: https://doukaudio.com/pages/contact-us
Warranty & registration: Warranty info
Support phone: +86-17704028602
Support email: nobsound@doukaudio.com
Contact form: Contact manufacturer support

Douk Audio manuals

Selected manuals from manuals+ curated for this brand.

DOUK AUDIO JAN5654 T4 PLUS HiFi Valve Tube Preamp Pre Amplifier Instruction Manual

November 10, 2023

DOUK AUDIO JAN5654 T4 PLUS HiFi Valve Tube Preamp Pre Amplifier Product Information Thank you for purchasing our product! Before using it, please read the following instructions carefully: VU Level…

DOUK AUDIO STB-01 LP Vinyl Turntables Metal Disc Stabilizer Record Weight HiFi Instruction Manual

November 10, 2023

DOUK AUDIO STB-01 LP Vinyl Turntables Metal Disc Stabilizer Record Weight HiFi Product Information The Turntable Disc Stabilizer Record Weight/Clamp is designed to improve the performance of your turntable. It…

DOUK AUDIO ST-01 PRO 200W Hifi Valve Amplifier Mini Audio Receiver Bluetooth User Manual

November 8, 2023

DOUK AUDIO ST-01 PRO 200W Hifi Valve Amplifier Mini Audio Receiver Bluetooth User Manual ST-01 front and back panel VU meter Input channel Indicator(Bluetooth/RCA/Optical/Coaxial/USB) Functional knob (short press to power…

DOUK AUDIO A1 320W Bluetooth 5.0 Hi-Fi Amplifier 2.0 Channel Stereo Receiver User Manual

November 8, 2023

DOUK AUDIO A1 320W Bluetooth 5.0 Hi-Fi Amplifier 2.0 Channel Stereo Receiver User Manual M1 PRO front & back panel Power on/off; Input switch (between RCA and USB/BT) Previous song…

DOUK AUDIO X1 HiFi Stereo Bluetooth 5.0 GE5654 Valve Tube Amplifier Instruction Manual

November 8, 2023

DOUK AUDIO X1 HiFi Stereo Bluetooth 5.0 GE5654 Valve Tube Amplifier Thank you very much for choosing our products!Please read this manual carefully before using the product. Functional specifications: On/off…

DOUK AUDIO A1 Bluetooth 5.0 Digital Power Amplifier User Manual

November 8, 2023

DOUK AUDIO A1 Bluetooth 5.0 Digital Power Amplifier M4 front and back panel On/off; Input switch (between AUX and USB/BT) Previous song Play/Pause (short press); U-disk/Bluetooth(long press) Next song Power…

Douk Audio VU3 Dual Analog VU Meter User Manual

July 24, 2023

Douk Audio VU3 Dual Analog VU Meter INTRODUCTION VU3 is a multifunctional device integrating an analog VU meter & Amplifier/speaker switcher box, which can provide a wonderful visual experience when…

Douk Audio HiFi Stereo Bluetooth 5.0 Vacuum Tube Amplifier MM Phono Amp for Turntables User Manual

April 2, 2023

Douk Audio HiFi Stereo Bluetooth 5.0 Vacuum Tube Amplifier MM Phono Amp for Turntables Product Information Thank you for choosing our product! Please read the following information carefully before using…

Douk Audio M3 HiFi Bluetooth 5.0 Digital Instruction Manual

October 15, 2022

Douk Audio M3 HiFi Bluetooth 5.0 Digital Introductions Thank you very much for choosing our products! Please read this manual carefully before using the product. Front & Back panel interface…

Douk Audio M4 4 Channel Bluetooth Amplifier Instruction Guide

October 15, 2022

Douk Audio M4 4-Channel Bluetooth Amplifier Introductions Thank you very much for choosing our products! Please read this manual carefully before using the product. Front & Back panel interface function…

Douk Audio M10 Amplifier User Manual

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User manual for the Douk Audio M10 Hi-Fi Stereo Amplifier, detailing its features, connections, and operation for optimal audio performance.

Douk Audio T3 PLUS Valve Tube Preamp User Manual

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Comprehensive user manual for the Douk Audio T3 PLUS HiFi Vacuum Tube MM/MC Phono Preamp, detailing operation, specifications, and troubleshooting.

Douk Audio A5 Integrated Amplifier User Manual

User Manual

User manual for the Douk Audio A5 Integrated Amplifier, detailing its features, specifications, and operation.

Douk Audio MC5 Mini 4 Channel Stereo Audio Mixer User Manual

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User manual for the Douk Audio MC5 Mini 4 Channel Stereo Audio Mixer, detailing its passive circuit design, usage diagram, parameters, and contact information. Learn how to connect audio sources…

Douk Audio Little Bear MC102/MC1022 Audio Selector Manual

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User manual for the Douk Audio Little Bear MC102 and MC1022 audio selectors, detailing their features, usage, and specifications for 2-in-1-out and 1-in-2-out configurations.

DOUK AUDIO Nobsound M1 PRO Power Amplifier User Manual & FAQ

user manual

Comprehensive user manual and FAQ for the DOUK AUDIO Nobsound M1 PRO power amplifier, covering operation steps, technical specifications, troubleshooting, and contact information.

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

User Manual

Discover the Douk Audio M1 Pro, a 320W Bluetooth 5.0 stereo subwoofer amplifier and USB music player (DZ071). Featuring TDA7498E chip, RCA and U-disk input, and enhanced bass output for…

Douk Audio VU56 PRO Music Spectrum Display & Audio Converter Manual

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Explore the Douk Audio VU56 PRO, an advanced music spectrum display with VU and PPM modes, featuring RCA and 3.5mm AUX inputs/outputs, remote control, and 8 display effects. This manual…

Douk Audio manuals from online retailers

Douk Audio VU4 4-Channel Analog VU Meter & Audio Switcher Instruction Manual

VU4 • December 16, 2025

Comprehensive instruction manual for the Douk Audio VU4 4-Channel Analog VU Meter & Audio Switcher, covering setup, operation, features, and specifications.

Douk Audio VU56PRO MIC+LINE Stereo RGB LED Sound Level Meter Audio Splitter Switcher Music Spectrum Visualizer User Manual

VU56PRO • December 16, 2025

Comprehensive user manual for the Douk Audio VU56PRO MIC+LINE Stereo RGB LED Sound Level Meter Audio Splitter Switcher. Includes setup, operation, features, specifications, and troubleshooting.

Nobsound NS-10G Mini Bluetooth 5.0 Digital Amplifier User Manual

NS-10G • December 15, 2025

Comprehensive instruction manual for the Nobsound NS-10G Mini Bluetooth 5.0 Digital Amplifier, covering product features, setup, operation, troubleshooting, specifications, and maintenance.

Douk Audio M1FM HiFi Bluetooth 5.1 Digital Amplifier with FM Receiver User Manual

SUC-M1-FM • December 4, 2025

Comprehensive instruction manual for the Douk Audio M1FM amplifier, covering setup, operation, specifications, and troubleshooting for optimal audio performance.

Douk Audio Nobsound Little Bear MC103 3(1)-IN-1(3)-OUT XLR Balanced Stereo Audio Switcher User Manual

MC103 • December 3, 2025

This manual provides comprehensive instructions for the setup, operation, and maintenance of the Douk Audio Nobsound Little Bear MC103 XLR Balanced Stereo Audio Switcher, designed for managing multiple…

Douk Audio G7 600W 2/4 Channel Digital Amplifier Instruction Manual

G7 (SUC-G7-US) • December 2, 2025

Comprehensive instruction manual for the Douk Audio G7 600W 2/4 Channel Digital Amplifier, covering setup, operation, maintenance, and specifications for optimal home audio performance.

Douk Audio IR240 Sound Level Meter Digital Clock User Manual

IR240 • November 27, 2025

Comprehensive instruction manual for the Douk Audio IR240, a digital sound level meter, music spectrum visualizer, and LCD clock. Includes setup, operation, and specification details.

Douk Audio M4 4-Channel Bluetooth Amplifier User Manual

SUC-M4 • November 26, 2025

Comprehensive user manual for the Douk Audio M4 4-Channel Bluetooth Amplifier, covering setup, operation, maintenance, troubleshooting, and specifications.

Douk Audio VU3 Dual Analog VU Meter and 2-Way Amplifier/Speaker Switch User Manual

DOUK-VU3 • November 7, 2025

Comprehensive user manual for the Douk Audio VU3, detailing setup, operation, features, and specifications of this dual analog VU meter and 2-way amplifier/speaker switcher.

Douk Audio U8 HiFi Dual ES9038Q2M Bluetooth 5.0 Balanced DAC Instruction Manual

U8 • November 6, 2025

Comprehensive instruction manual for the Douk Audio U8 DAC, covering setup, operation, maintenance, troubleshooting, and specifications for optimal audio performance.

Douk Audio A100 TPA3255 Digital Power Amplifier User Manual

SUC-A100 • November 5, 2025

Comprehensive user manual for the Douk Audio A100 TPA3255 Digital Power Amplifier, covering setup, operation, maintenance, troubleshooting, and technical specifications for optimal performance.

Nobsound VFD Audio Spectrum Analyzer AK2515 PRO V3 User Manual

AK2515 PRO V3 • October 30, 2025

Instruction manual for the Nobsound VFD Audio Spectrum Analyzer AK2515 PRO V3, detailing setup, operation, features, and technical specifications for optimal use in home audio and studio environments.

Douk Audio VU9 Pixie Tube Sound Level Meter User Manual

VU9 • February 28, 2026

Instruction manual for the Douk Audio VU9 Pixie Tube Sound Level Meter, a retro-inspired music spectrum analyzer with microphone and AUX inputs, adjustable display modes, colors, and brightness.

Douk Audio P2 HiFi Vacuum Tube Preamp Bluetooth 5.0 Receiver Stereo Headphone Amplifier USB Music Player User Manual

P2 • February 27, 2026

The Douk Audio P2 is a versatile HiFi vacuum tube preamp that functions as a Bluetooth 5.0 receiver, stereo headphone amplifier, and USB music player. It features multiple…

Douk Audio T3-PLUS HiFi Vacuum Tube Preamp User Manual

T3-PLUS • February 26, 2026

Comprehensive user manual for the Douk Audio T3-PLUS HiFi Vacuum Tube Preamp, detailing setup, connection, operation, maintenance, and specifications for MM/MC phono turntables, AUX audio sources, and headphone…

Douk Audio NS-14G-PRO HiFi 2.1 Channel Bluetooth TPA3255 Digital Amplifier User Manual

NS-14G-PRO • February 24, 2026

Comprehensive instruction manual for the Douk Audio NS-14G-PRO HiFi 2.1 Channel Bluetooth TPA3255 Digital Amplifier, covering setup, operation, specifications, and maintenance.

Douk Audio M10 Mini Bluetooth Amplifier User Manual

M10 • February 11, 2026

Comprehensive instruction manual for the Douk Audio M10 Mini Bluetooth Amplifier, covering setup, operation, maintenance, troubleshooting, and specifications for optimal audio experience.

Douk Audio Mini Digital Amplifier M100 User Manual

M100 • February 9, 2026

Comprehensive user manual for the Douk Audio M100 Mini Digital Amplifier, covering setup, operation, specifications, and troubleshooting for home, car, and marine audio systems.

Douk Audio P7 HiFi Phono Stage Tube Preamp User Manual

P7 • February 6, 2026

Comprehensive instruction manual for the Douk Audio P7 HiFi Phono Stage Tube Preamp, covering setup, operation, maintenance, troubleshooting, and specifications for optimal audio performance.

Douk Audio T7 7-Band Equalizer Balanced XLR / RCA Preamp User Manual

T7 • February 2, 2026

Comprehensive instruction manual for the Douk Audio T7 7-Band Equalizer Balanced XLR / RCA Preamp, covering setup, operation, maintenance, specifications, and troubleshooting.

Douk Audio L3 3 Channel Loop Switcher Box User Manual

L3 • February 1, 2026

Comprehensive user manual for the Douk Audio L3 3 Channel Loop Switcher Box, including setup, operating modes, specifications, and troubleshooting.

Douk Audio 1(3)-IN-3(1)-OUT XLR Balanced Audio Converter Stereo Passive Selector Switcher User Manual

MC103-Pro • January 26, 2026

Comprehensive user manual for the Douk Audio MC103-Pro XLR Balanced Audio Converter Stereo Passive Selector Switcher, detailing setup, operation, maintenance, troubleshooting, specifications, and user tips.

Douk Audio NS-13G-MAX HiFi 2.0 Channel Stereo Audio Amplifier User Manual

NS-13G-MAX • January 22, 2026

Instruction manual for the Douk Audio NS-13G-MAX HiFi 2.0 Channel Stereo Audio Amplifier, covering setup, operation, maintenance, troubleshooting, and specifications.

Douk Audio U3 Mini Pure Class A Headphone Amplifier User Manual

U3 • January 17, 2026

Comprehensive instruction manual for the Douk Audio U3 Mini Pure Class A Headphone Amplifier, covering setup, operation, specifications, maintenance, troubleshooting, and user tips for optimal audio performance.

Douk Audio video guides

Watch setup, installation, and troubleshooting videos for this brand.

Douk Audio EQ5 5-Band EQ Preamplifier for HiFi Audio Systems

0:21 • 854×480 • visual_overview

Douk Audio U3 Mini Class A Headphone Amplifier for High-Impedance Headphones

0:30 • 1920×1080 • visual_overview

Douk Audio U3 Mini Class A Headphone Amplifier - High-Impedance Hifi Desktop Amp

0:30 • 1280×720 • feature_demo

Douk Audio U3 Mini Class A Headphone Amplifier: HiFi Desktop Stereo Amp Overview

0:30 • 854×480 • visual_overview

Douk Audio L3 3-Channel Stereo Audio Loop Switcher with VU Meter Setup & Features

1:36 • 854×480 • instructions

Douk Audio L3 3-Channel Stereo Audio Loop Switcher with VU Meter Setup & Feature Demo

1:36 • 1920×1080 • setup

Douk Audio L3 3-Channel Stereo Audio Loop Switcher with VU Meter Setup & Features

1:36 • 1280×720 • instructions

Douk Audio Manuals & User Guides

Douk Audio manuals

Douk Audio manuals from online retailers

Douk Audio EQ5 5-Band EQ Preamplifier for HiFi Audio Systems

Douk Audio U3 Mini Class A Headphone Amplifier for High-Impedance Headphones

Douk Audio U3 Mini Class A Headphone Amplifier - High-Impedance Hifi Desktop Amp

Douk Audio U3 Mini Class A Headphone Amplifier: HiFi Desktop Stereo Amp Overview

Douk Audio L3 3-Channel Stereo Audio Loop Switcher with VU Meter Setup & Features

Douk Audio L3 3-Channel Stereo Audio Loop Switcher with VU Meter Setup & Feature Demo

Douk Audio L3 3-Channel Stereo Audio Loop Switcher with VU Meter Setup & Features

Douk Audio VU9 LED Audio Spectrum Analyzer Setup & Feature Demo

Douk Audio VU9 Pixie Tube Sound Level Meter Setup & Demo

Douk Audio VU2 Analog VU Meter & 4-Way Audio Input Output Switcher Demo

Douk Audio VU2 Analog VU Meter & 4-Way Audio Switcher DB/ACG Mode Test

Douk Audio P1 Preamp: HiFi Tube DAC with Bluetooth and Headphone Amplifier