Introducció
The Nobsound Douk Audio U4 Mini is a versatile HiFi audio device designed to enhance your listening experience. It functions as a Bluetooth 5.0 receiver, USB DAC, headphone amplifier, and stereo audio preamplifier. Featuring a classic 6N3 vacuum tube, it delivers a warm, clear, and smooth sound, effectively eliminating harsh digital artifacts. This manual provides detailed instructions for setup, operation, and maintenance to ensure optimal performance.
Característiques del producte
- Disseny multifuncional: Combines Bluetooth receiver, USB DAC, headphone amplifier, and preamplifier capabilities in one compact unit.
- Connectivitat versàtil: Supports Bluetooth 5.0 and USB audio inputs, with Stereo RCA, 3.5mm AUX, and 3.5mm headphone jack outputs.
- Vacuum Tube Sound: Incorporates a 6N3 vacuum tube for a warm, clear, soft, and sweet audio signature, ideal for vocals, string instruments, and classical music.
- Components d'alta qualitat: Features QCC3008 Bluetooth chip (supporting APT-X, APTX-LL), TDA1543 decode chip, 2704 USB chip, and MAX9722 headphone amplifier chip.
- Àmplia compatibilitat: USB audio input is compatible with Windows, Mac, Linux systems, and Android smartphones with OTG function, offering plug-and-play convenience without drivers.
- Sortida d'auriculars potent: The MAX9722 headphone amplifier provides 300mW output, capable of driving most headphones with impedances from 16 to 600 ohms.
Contingut del paquet
Si us plau, comproveu el paquet per veure si hi ha els elements següents:
- 1 x Douk Audio U4 Mini Headphone Ampmés viu
- 1 x 6N3 Vacuum Tube
- 1 x adaptador d’alimentació de 12V
- 1 x cable USB
- 1 x antena Bluetooth
Configuració
- Instal·lació de tubs: Carefully insert the 6N3 vacuum tube into its socket on the top of the unit. Ensure it is seated firmly but do not force it.
- Bluetooth Antenna Connection: Screw the provided Bluetooth antenna onto the 'ANT' connector on the rear panel.
- Connexió d'alimentació: Connect the 12V power adapter to the 'DC 12V' input on the rear panel, then plug the adapter into a power outlet.
- Connexió de sortida d'àudio:
- For speakers or a power amplifier, connect the 'AUDIO OUT' RCA jacks to your audio system using RCA cables.
- For headphones, plug your 3.5mm headphones into the 'PHONE' jack on the front panel.
- Connexió d'entrada d'àudio:
- Entrada USB: Connect your computer (Windows, Mac, Linux) or Android smartphone (with OTG) to the 'PC-USB' port on the rear panel using the supplied USB cable.
- Entrada Bluetooth: Ensure the Bluetooth antenna is connected. The device will be discoverable for pairing.
Image: Rear panel showing 'AUDIO OUT' (RCA/3.5mm), 'PC-USB', 'ANT' (Bluetooth antenna), and 'DC 12V' power input.
Image: Illustrates USB compatibility with various operating systems including Windows, Mac, Linux, and Android devices.
Instruccions de funcionament
- Encès/apagat: Press the 'POWER' switch on the front panel to turn the unit on or off. The vacuum tube will glow when powered on.
- Selecció d'entrada: Use the 'SELECT' switch on the front panel to cycle between USB and Bluetooth inputs. The corresponding LED indicator (USB or Bluetooth) will light up.
- Emparellament Bluetooth:
- Switch the input to Bluetooth. The Bluetooth LED will blink, indicating it's in pairing mode.
- On your source device (smartphone, tablet, etc.), search for Bluetooth devices and select "Douk Audio U4 Mini" to pair.
- Once paired, the Bluetooth LED will remain solid.
- Control de volum: Adjust the 'VOLUME' knob on the front panel to control the output level for both headphone and RCA/AUX outputs. Start with a low volume and gradually increase it to a comfortable listening level.
- Ús d'auriculars: When headphones are plugged into the 'PHONE' jack, the RCA/AUX outputs may be muted depending on the unit's design. Unplug headphones to resume output to speakers.
Image: Front panel showing Power switch, Select switch, Phone jack, Volume knob, and Power/USB/Bluetooth indicators.
Image: A user wearing headphones connected to the Douk Audio U4 Mini, demonstrating its headphone ampfunció de lifier.
Manteniment
- Neteja: Use a soft, dry cloth to clean the unit. Do not use liquid cleaners or solvents.
- Vacuum Tube Care: The vacuum tube can become hot during operation. Avoid touching it. If replacement is needed, ensure the unit is powered off and cooled down before handling the tube.
- Col·locació: Col·loqueu la unitat sobre una superfície estable i plana, allunyada de la llum solar directa, fonts de calor i humitat excessiva. Assegureu-vos que hi hagi una ventilació adequada al voltant de la unitat.
- Emmagatzematge: Si guardeu la unitat durant un període prolongat, desconnecteu-la de l'alimentació i guardeu-la en un lloc fresc i sec.
Resolució de problemes
| Problema | Causa possible | Solució |
|---|---|---|
| Sense sortida de so | Unit not powered on; incorrect input selected; cables loose; volume too low; headphones plugged in (muting RCA/AUX). | Check power switch; verify input selection; ensure all cables are securely connected; increase volume; unplug headphones if using RCA/AUX. |
| Bluetooth no connectat | Bluetooth input not selected; antenna not connected; device too far; already paired with another device. | Select Bluetooth input; ensure antenna is connected; move source device closer; disconnect from other devices and try pairing again. |
| So distorsionat | Volume too high; faulty cables; source audio quality issues; vacuum tube issue. | Reduce volume; try different cables; check source audio; ensure vacuum tube is properly seated. |
| No USB audio | USB input not selected; USB cable faulty; computer/phone not recognizing device. | Select USB input; try a different USB cable; check device manager on PC or audio settings on Mac/Android. |
Especificacions
| Característica | Detall |
|---|---|
| Entrada d'àudio | Bluetooth 5.0, USB |
| Sortida d'àudio | Stereo RCA, 3.5mm AUX, 3.5mm Headphone Jack |
| Xip Bluetooth | QCC3008 (supports APT-X, APTX-LL) |
| Decode Chip | TDA1543 |
| Xip USB | 2704 (supports up to 16bit/96kHz) |
| Auriculars Amp Xip | MAX9722 |
| Relació senyal/soroll (SNR) | > 99 dB |
| Interval dinàmic | > 99 dB |
| Potència de sortida dels auriculars | 300 mW |
| Impedància dels auriculars | 16-600Ω |
| Total Harmonic Distortion + Noise (THD + N) | 0.004% (RL> 10kΩ) |
| Dimensions (L*W*H) | 97 * 77 * 32mm (3.82 * 3.03 * 1.26 inches) |
| Pes de la unitat | 250 g |
| Pes del paquet | 470 g |
Image: Diagram showing the dimensions of the Douk Audio U4 Mini in millimeters and inches.
Image: Internal architecture diagram highlighting the MAX9722 (Amp), TDA1543 (Decode), 2704 (USB), and QCC3008 (Bluetooth) chips.
Garantia i suport
Nobsound products are designed for reliability and performance. For warranty information, please refer to the documentation included with your purchase or contact your retailer. For technical support, please visit the official Nobsound website or contact their customer service department. Please have your model number (U4 Mini or DZ077) and purchase details ready when seeking support.
