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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.

About Douk Audio manuals on Manuals.plus

Douk Audio (often associated with the brand Nobsound) is a manufacturer dedicated to measuring and delivering high-quality audio experiences at an affordable price point. Specializing in Hi-Fi components, Douk Audio produces a diverse range of equipment including vacuum tube amplifiers, digital power amps, preamplifiers, and audio spectrum analyzers.

With a focus on compact design and versatile connectivity, their products are designed to integrate seamlessly into modern desktop setups, home theaters, and gaming stations. Whether you are looking for the warm sound of tubes or the precision of digital audio, Douk Audio offers solutions that combine vintage charm with contemporary technology.

Douk Audio manuals

Latest manuals from manuals+ curated for this brand.

DOUK AUDIO A5 Integrated Amplifier User Manual

June 30, 2025
DOUK AUDIO A5 Integrated Amplifier A5 Front and Rear Panel High-pass filter switch/adjustment knob Power on/off; volume knob RCA input Pre-out Speaker output (red to positive, black to negative; R…

Douk Audio SP102 Passive Audio Selector User Manual

manual
User manual for the Douk Audio SP102 passive audio selector, detailing its features, operation, specifications, and contact information. Supports 200W per channel and multiple amplifier/speaker configurations.

Douk Audio D1 Audio Amplifier User Manual

User Manual
User manual for the Douk Audio D1 audio amplifier, detailing its features, specifications, front and rear panel controls, and operational instructions for optimal audio performance.

Douk Audio M5.1 Amplifier User Manual and Specifications

User Manual
This manual provides comprehensive instructions for the Douk Audio M5.1 amplifier, including setup, operation, troubleshooting FAQs, technical parameters, and front/back panel descriptions. Learn how to connect your audio sources and…

ONE Little Bear P32 FU32 Tube Hybrid Headphone Amplifier

product overview
Detailed overview of the ONE Little Bear P32 FU32 tube hybrid headphone amplifier by Douk audio. Features include vacuum tube amplification, multiple input/output options, upgradeable OP chips, and specifications for…

Douk Audio manuals from online retailers

Douk Audio NS-01G MAX HIFI Mini Amplifier User Manual

NS-01G MAX • January 6, 2026
Comprehensive user manual for the Douk Audio NS-01G MAX HIFI Mini Amplifier, covering setup, operation, specifications, and troubleshooting for this digital power amp and Bluetooth receiver.

Douk Audio HiFi EQ9 9-Band Stereo EQ Preamp User Manual

EQ9 • December 27, 2025
Comprehensive instruction manual for the Douk Audio HiFi EQ9 9-Band Stereo EQ Preamp, covering setup, operation, maintenance, troubleshooting, and technical specifications for home and car audio systems.

Douk Audio VFD253 Audio Spectrum Analyzer User Manual

VFD253 • December 27, 2025
Comprehensive user manual for the Douk Audio VFD253 Audio Spectrum Analyzer, Bluetooth 5.0 Receiver, 3.5mm AUX Selector, and Home Desk Clock with Remote Control. Includes setup, operation, specifications,…

Douk Audio support FAQ

Common questions about manuals, registration, and support for this brand.

  • Why is there no sound coming from my Douk Audio amplifier?

    Check that the power supply is properly connected and the correct input mode (Bluetooth, RCA, USB, etc.) is selected. Ensure volume levels on both the audio source and the amplifier are turned up. If using vacuum tubes, ensure they are fully seated in their sockets.

  • How do I connect my device via Bluetooth?

    Switch the amplifier's input selector to Bluetooth mode. The indicator light typically flashes when in pairing mode. Search for 'Douk Audio' or the specific model name on your smartphone or computer and select it to pair.

  • Do I need a driver for the PC-USB connection?

    For many models, connection to Windows 10/11, macOS, and Linux is plug-and-play. However, some high-resolution playback or Windows 7 systems may require a specific driver available from the Douk Audio website.

  • Why is the sound distorted?

    Distortion often occurs if the input signal level is too high or the volume is maximized on both the source and the amp. Try lowering the volume on your source device and increasing it on the amplifier instead.

  • Where can I find replacement vacuum tubes?

    Many Douk Audio/Nobsound amplifiers use common tube types line 6J1, 6J5, or 6K4. Refer to your user manual for the specific socket type and compatible replacements, which can be purchased from Douk Audio or third-party electronics retailers.