📘 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 T4 Pro Vacuum Tube Phono Preamp MM Turntable Preamplifier User Manual

December 26, 2023

DOUK AUDIO T4 Pro Vacuum Tube Phono Preamp MM Turntable Preamplifier User Manual PRO front and back panel 3.5mm AUX input 3.5mm headphone output Power on/off; volume knob (Anti-clockwise rotate…

DOUK AUDIO D05 HiFi Stereo Bluetooth 5.0 Power Amplifier Subwoofer Audio Amplifier Instruction Manual

December 26, 2023

Instruction Manual Thank you very much for choosing our products!Please read this manual carefully before using the product. Instruction of Front & Rear Surface: ... ... ... ... ...... ...…

DOUK AUDIO 168 Plus Bluetooth Power Amplifier Instructions

December 11, 2023

DOUK AUDIO 168 Plus Bluetooth Power Amplifier Specifications Model: Lepy 168 Plus Amplifier Power Adapter: Included Power Supply Cable: Included User Manual: Included Remote Control: Yes (battery not included, requires…

Douk Audio DZ044-UK TONE Bluetooth Digital Power Amplifier User Manual

December 9, 2023

Douk Audio DZ044-UK TONE Bluetooth Digital Power Amplifier Product Information Specifications Model: Douk Audio TONE Type: Bluetooth Digital Power Amplifier Power Supply: Default 19V/3.42A Output Power: Up to 50W*2 Audio…

DOUK AUDIO VU2 MIC+LINE Dual Analog VU Meter Stereo RCA Audio Splitter User Manual

December 6, 2023

MAKE HI - FI AFFORDABLE ONE Little Bear MANUAL Introduction VU2 is multi-functional VU meter & audio splitter box originally designed by Douk Audio: Can be used as an analog VU…

DOUK AUDIO M100 Mini Bluetooth 5.0 Digital Amplifier User Manual

December 3, 2023

DOUK AUDIO M100 Mini Bluetooth 5.0 Digital Amplifier User Manual Warm Tips USB input also supports mobile phones that with OTG functions, but Android system needs OTG cable and IOS…

DOUK AUDIO U2 Pro Mini XMOS USB to Coaxial Optical Converter User Manual

November 30, 2023

U2 / U2 Pro Mini XMOS USB to Coaxial /Optical Converter Thank you very much for choosing our products, please read this manual carefully before using. Introduction This is a…

DOUK AUDIO MV-01 Nobsound Passive Volume Controller Knob User Manual

November 23, 2023

Passive Volume Controller Knob for PC User Manual Warm Tips MV-01 volume knob can also adjust headphone's volume (but without any amplification function), the headphones of impedance between 32-300Ω can…

DOUK AUDIO LP-269S HiFi Stereo Multimedia 4 Channel Bluetooth Power Amplifier Instructions

November 21, 2023

DOUK AUDIO LP-269S HiFi Stereo Multimedia 4 Channel Bluetooth Power Amplifier Instructions Bluetooth Power Amplifier Music Player for Home/Car How to use Connect speakers to the output of amplifier. Wired…

DOUK AUDIO GFJ782 Mini Bluetooth Power Amplifier User Manual

November 20, 2023

DOUK AUDIO GFJ782 Mini Bluetooth Power Amplifier User Manual Warm tips TF card and USB input made only can be selected after you insert TF card and U-disk, or…

Douk Audio U3, U3 PRO, U10 Headphone Amplifiers User Manual

manual

Comprehensive user manual for Douk Audio U3, U3 PRO, and U10 headphone amplifiers, detailing features, specifications, operation, and troubleshooting for these audio devices.

Douk Audio T4 PLUS User Manual: Setup, Operation, and Specifications

user manual

Comprehensive user manual for the Douk Audio T4 PLUS phono preamplifier, detailing setup instructions, operational guidelines, technical specifications, and troubleshooting tips for vinyl playback enhancement.

Douk Audio VU9 & VU9 MINI Music Spectrum Visualizer User Manual

User Manual

Detailed user manual for the Douk Audio VU9 and VU9 MINI music spectrum visualizers, covering features, setup, operation, specifications, and FAQs. Enhance your audio experience with synchronized LED lights.

Douk Audio DAC-Q11 User Manual: Setup, Specifications, and Troubleshooting

user manual

Comprehensive user manual for the Douk Audio DAC-Q11 Digital to Analog Converter. Learn about its features, specifications, setup instructions, PC-USB driver installation, connection diagrams, and troubleshooting tips.

Douk Audio VU9 & VU9 MINI Music Spectrum Visualizer User Manual

manual

User manual for Douk Audio VU9 and VU9 MINI music spectrum visualizers, covering setup, operation, specifications, and troubleshooting for these LED audio display devices.

Douk Audio Q100 Audio Amplifier User Manual

User Manual

Comprehensive user manual for the Douk Audio Q100 audio amplifier. This guide provides detailed information on setup, operation, specifications, and troubleshooting for the Q100 model.

One Little Bear MC104 PRO 4-way Analog Audio Switcher Box - Product Overview

Product Overview

Overview of the One Little Bear MC104 PRO 4-way Analog Audio Switcher Box by DOUK AUDIO. Features 4-IN-1-OUT and 1-IN-4-OUT audio selection with 3.5mm AUX interfaces, passive design, and independent…

Douk Audio MC1023/MC1024/MC1024-BOX 2-Way Audio Switcher User Manual

User Manual

Comprehensive user manual for Douk Audio's MC1023, MC1024, and MC1024-BOX 2-way speaker and headphone audio switchers. Features include A/B input selection, volume control, and microphone muting. Details setup, parameters, and…

DOUK AUDIO AS1424 LED Music Spectrum MIC Sound Level Analyzer - User Guide

User Guide

Official user guide for the DOUK AUDIO AS1424 LED Music Spectrum MIC Sound Level Analyzer. Learn how to use its key operations, understand connections, potentiometer functions, view specifications, packing list,…

DOUK AUDIO M100 Bluetooth 5.0 USB DAC Amplifier - User Manual

User Manual

This user manual provides detailed information for the DOUK AUDIO M100, a compact Mini Bluetooth 5.0 Digital Amplifier with USB DAC, COAX/OPT inputs. It supports Home Audio applications, offers 24Bit/192K…

DOUK AUDIO VU1 PRO VU Meter & Audio Converter User Manual

user manual

Official user manual for the DOUK AUDIO VU1 PRO VU Meter and Audio Converter. Learn about its features, parameters, operation, and troubleshooting.

Douk Audio L1 Mini Stereo Amplifier User Manual and Specifications

manual

Comprehensive user manual for the Douk Audio L1 mini stereo amplifier. Learn about its features, applications, how to use it, and technical specifications for boosting audio output.

Douk Audio manuals from online retailers

Nobsound NS-20G Mini Bluetooth 5.0 Power Amplifier User Manual

DZ045S • January 26, 2026

Comprehensive instruction manual for the Nobsound NS-20G Mini Bluetooth 5.0 Power Amplifier, covering setup, operation, maintenance, and specifications.

Douk Audio T14 Phono Preamplifier Instruction Manual

T14 • January 26, 2026

Comprehensive instruction manual for the Douk Audio T14 Phono Preamplifier, covering setup, operation, specifications, and troubleshooting for MM/MC record players and headphones.

Douk Audio Nobsound MC103 Pro 1-In-3-Out XLR Audio Switch User Manual

GFJ721-3M • January 26, 2026

This manual provides instructions for the Douk Audio Nobsound MC103 Pro 1-In-3-Out XLR Audio Switch. Learn about its features, setup, operation, and maintenance for optimal performance with your…

Douk Audio VU56C 56-Bit Level Meter Instruction Manual

VU56C • January 25, 2026

Comprehensive instruction manual for the Douk Audio VU56C 56-Bit Level Meter, LED Music Spectrum, Stereo Sound Indicator, and Audio Display. Learn about setup, operation, features, and troubleshooting.

Douk Audio Nobsound T3 MM Phono Preamplifier User Manual

T3 • January 24, 2026

Comprehensive instruction manual for the Douk Audio Nobsound T3 MM Phono Preamplifier, covering setup, operation, maintenance, and troubleshooting for optimal audio performance.

Douk Audio Music Level Meter AK_DB16L_MIC Instruction Manual

AK_DB16L_MIC • January 24, 2026

Comprehensive instruction manual for the Douk Audio AK_DB16L_MIC 16-Bit LED Music Level Meter, covering setup, operation, maintenance, and specifications.

Douk Audio Nobsound DZ039 Schumann Wave 7.83HZ Ultra-Low Frequency Pulse Generator Instruction Manual

DZ039 • January 14, 2026

Comprehensive instruction manual for the Douk Audio Nobsound DZ039 Schumann Wave Generator, detailing setup, operation, features, and specifications for optimal use.

Douk Audio VFD253 Audio Spectrum Analyzer User Manual

VFD253 • January 13, 2026

Comprehensive user manual for the Douk Audio VFD253 Audio Spectrum Analyzer, Bluetooth 5.0 Receiver, and 3.5mm AUX Selector, covering setup, operation, features, and specifications.

Douk Audio A5 TPA3255 Stereo Amplifier Instruction Manual

A5 • January 10, 2026

Comprehensive instruction manual for the Douk Audio A5 2-channel TPA3255 stereo amplifier, covering setup, operation, maintenance, and specifications.

Douk Audio Little Bear T7 Vacuum Tube Phono Preamplifier User Manual

T7 • January 6, 2026

Detailed instruction manual for the Douk Audio Little Bear T7 Vacuum Tube Phono Preamplifier, covering setup, operation, maintenance, and specifications for MM turntables and Hi-Fi audio systems.

Douk Audio ST-01 Plus TPA3255 Bluetooth Amplifier User Manual

ST-01 Plus • January 5, 2026

Comprehensive instruction manual for the Douk Audio ST-01 Plus 2-Channel TPA3255 Bluetooth Amplifier, covering setup, operation, features, specifications, and troubleshooting.

Douk Audio G3 PRO Bluetooth 5.0 Power Amplifier and Headphone Amplifier User Manual

G3 PRO • January 2, 2026

Comprehensive user manual for the Douk Audio G3 PRO, covering setup, operation, features, specifications, and troubleshooting for this Bluetooth 5.0 power amplifier and headphone amplifier.

Nobsound EQ5 TONE Mini Bluetooth 5-Band EQ Equalizer Audio Preamp User Manual

EQ5-TONE • 1 PDF • May 10, 2026

Comprehensive instruction manual for the Nobsound EQ5 TONE Mini Bluetooth 5-Band EQ Equalizer Audio Preamp, covering setup, operation, features, specifications, and troubleshooting.

Douk Audio T14-EQ Stereo RIAA MM/MC Phono Stage Preamplifier User Manual

T14-EQ • May 3, 2026

Instruction manual for the Douk Audio T14-EQ phono stage preamplifier, covering setup, operation, specifications, and troubleshooting for MM/MC turntables with headphone output.

Nobsound BSA-600 Bass Shaker Amplifier User Manual

BSA-600 • May 1, 2026

Comprehensive user manual for the Nobsound BSA-600 230W Bridge Stereo/Mono Bass Shaker Amplifier, including setup, operation, specifications, and troubleshooting.

Douk Audio T4 PLUS Tube Preamp User Manual

T4 PLUS • 1 PDF • April 28, 2026

Comprehensive instruction manual for the Douk Audio T4 PLUS 6CS6 Vacuum Tube Phono Stage Preamp, Headphone Amp, and Stereo Audio Preamp. Includes setup, operation, specifications, troubleshooting, and safety…

Douk Audio P10 PRO Portable Tube Headphone Amplifier User Manual

P10 PRO • 1 PDF • April 24, 2026

Comprehensive user manual for the Douk Audio P10 PRO Portable Tube Headphone Amplifier, including setup, operation, maintenance, troubleshooting, specifications, and user tips.

Douk Audio VU3PRO Amplifier/Speaker Selector with VU Meter 2-IN-2-OUT Switcher Box User Manual

VU3PRO • 1 PDF • April 19, 2026

Instruction manual for the Douk Audio VU3PRO Amplifier/Speaker Selector, featuring 2-IN-2-OUT switching, VU meters, and remote control. Learn about setup, operation, maintenance, and specifications.

Douk Audio P1 HiFi Tube Preamp User Manual

P1 • April 16, 2026

The Douk Audio P1 is a versatile HiFi tube preamp, USB DAC, and headphone amplifier featuring Bluetooth 5.0 with APTX-HD, PC-USB input, and RCA input/output. It delivers a…

Nobsound MV-01 Mini 3.5mm Volume Controller User Manual

MV-01 • April 11, 2026

Comprehensive instruction manual for the Nobsound MV-01 Mini 3.5mm Volume Controller, including setup, operation, specifications, and troubleshooting.

Douk Audio P2 Mini Tube Preamp User Manual

P2 • April 4, 2026

Comprehensive user manual for the Douk Audio P2 Mini Bluetooth 5.0 Vacuum Tube Preamp, HiFi Stereo Receiver, USB Player, and Audio Headphone Amplifier. Includes setup, operation, specifications, and…

Douk Audio ST-01PLUS HiFi Bluetooth TPA3255 Digital Amplifier VU Meter Turntable Audio Stereo Amp User Manual

ST-01PLUS • April 1, 2026

A comprehensive user manual for the Douk Audio ST-01PLUS HiFi Bluetooth TPA3255 Digital Amplifier, detailing setup, operation, maintenance, troubleshooting, and technical specifications.

Douk Audio U4 Tube Headphone Amplifier and Preamp User Manual

U4 • March 26, 2026

Comprehensive user manual for the Douk Audio U4 Bluetooth 5.0 Tube Headphone Amplifier, Mini Stereo Audio Preamp, and USB DAC Sound Card. Includes setup, operation, specifications, and troubleshooting.

Douk Audio P10 Desktop Class A Headphone Amplifier User Manual

P10 • March 26, 2026

Comprehensive instruction manual for the Douk Audio P10 Desktop Class A Headphone Amplifier, covering setup, operation, maintenance, troubleshooting, and specifications for optimal audio performance.

Douk Audio video guides

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

Douk Audio H8 HiFi Tube Balanced XLR Preamp & Headphone Amplifier with Bluetooth

0:30 • 1920×1080 • visual_overview

DOUK AUDIO ST-01 Hybrid Tube Amplifier: HiFi Audio Preamp & Power Amp Demo

0:23 • 1280×720 • feature_demo

Douk Audio M4 Power Amplifier with Bluetooth 5.0, 4-Channel Output, and USB Input

0:28 • 1920×1080 • feature_demo

Douk Audio H6 HiFi S/PDIF USB DAC Preamp Bluetooth Receiver Demonstration

0:30 • 1920×1080 • feature_demo

Douk Audio ST-01 Tube Amplifier with VU Meter and Multiple Inputs

0:23 • 1280×720 • visual_overview

Douk Audio ST-01 HiFi Vacuum Tube Amplifier: Visual Overview & Features

0:23 • 1280×720 • visual_overview

Douk Audio P6 MINI HiFi Vacuum Tube Preamp: Bluetooth 5.0, RCA, U-disk Inputs & Tone Control

0:29 • 1280×720 • feature_demo

Douk Audio T4 Pro MM Phono Preamp & Tube Headphone Amplifier with JAN5654 Tubes

0:30 • 1920×1080 • feature_demo

Douk Audio VU9 Pixie Tube Sound Level Meter: Retro Audio Spectru Display

0:40 • 1920×1080 • feature_demo

Douk Audio Manuals & User Guides

Douk Audio manuals

Douk Audio manuals from online retailers

Douk Audio T4 Plus Mini Vacuum Tube Stereo Preamp with VU Meter for HiFi Audio

Douk Audio L3 Stereo Audio Loop Switcher with VU Meter and RCA Inputs

Douk Audio VU9MINI RGB LED Tube Sound Level Meter Music Spectrum Display Demo

Douk Audio H8 HiFi Tube Balanced XLR Preamp & Headphone Amplifier with Bluetooth

DOUK AUDIO ST-01 Hybrid Tube Amplifier: HiFi Audio Preamp & Power Amp Demo

Douk Audio M4 Power Amplifier with Bluetooth 5.0, 4-Channel Output, and USB Input

Douk Audio H6 HiFi S/PDIF USB DAC Preamp Bluetooth Receiver Demonstration

Douk Audio ST-01 Tube Amplifier with VU Meter and Multiple Inputs

Douk Audio ST-01 HiFi Vacuum Tube Amplifier: Visual Overview & Features

Douk Audio P6 MINI HiFi Vacuum Tube Preamp: Bluetooth 5.0, RCA, U-disk Inputs & Tone Control

Douk Audio T4 Pro MM Phono Preamp & Tube Headphone Amplifier with JAN5654 Tubes

Douk Audio VU9 Pixie Tube Sound Level Meter: Retro Audio Spectru Display