소개
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.
제품 특징
- 다기능 디자인: Combines Bluetooth receiver, USB DAC, headphone amp증폭기 및 사전amplifier capabilities in one compact unit.
- 다양한 연결성: Supports Bluetooth 5.0 and USB audio inputs, with Stereo RCA, 3.5mm AUX, and 3.5mm headphone jack outputs.
- 진공관 소리: Incorporates a 6N3 vacuum tube for a warm, clear, soft, and sweet audio signature, ideal for vocals, string instruments, and classical music.
- 고품질 부품: Features QCC3008 Bluetooth chip (supporting APT-X, APTX-LL), TDA1543 decode chip, 2704 USB chip, and MAX9722 headphone amp증폭기 칩.
- 폭넓은 호환성: USB audio input is compatible with Windows, Mac, Linux systems, and Android smartphones with OTG function, offering plug-and-play convenience without drivers.
- Powerful Headphone Output: The MAX9722 headphone amplifier provides 300mW output, capable of driving most headphones with impedances from 16 to 600 ohms.
패키지 내용
다음 품목이 패키지에 포함되어 있는지 확인하세요.
- 1 x Douk Audio U4 Mini Headphone Amp리퍼
- 1 x 6N3 Vacuum Tube
- 1 x 12V 전원 어댑터
- 1 x USB 케이블
- 1 x 블루투스 안테나
설정
- 튜브 설치: 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: 제공된 블루투스 안테나를 후면 패널의 'ANT' 커넥터에 나사로 고정하십시오.
- 전원 연결: Connect the 12V power adapter to the 'DC 12V' input on the rear panel, then plug the adapter into a power outlet.
- 오디오 출력 연결:
- 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.
- 오디오 입력 연결:
- USB 입력 : 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.
- 블루투스 입력 : 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.
작동 지침
- 전원 켜기/끄기: Press the 'POWER' switch on the front panel to turn the unit on or off. The vacuum tube will glow when powered on.
- 입력 선택: 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.
- 블루투스 페어링 :
- 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.
- 볼륨 조절: 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.
- 헤드폰 사용법: 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 amp리파이어 기능.
유지
- 청소: 부드럽고 마른 천으로 제품을 닦으십시오. 액체 세척제나 용제를 사용하지 마십시오.
- 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.
- 놓기: 제품을 직사광선, 열원 및 과도한 습기를 피해 안정적이고 평평한 곳에 놓으십시오. 제품 주변에 적절한 환기가 이루어지도록 하십시오.
- 저장: 장기간 보관할 경우 전원을 끄고 서늘하고 건조한 곳에 보관하세요.
문제 해결
| 문제 | 가능한 원인 | 해결책 |
|---|---|---|
| 사운드 출력이 없습니다 | 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. |
| 블루투스가 연결되지 않습니다 | 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. |
| 왜곡된 소리 | 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. |
명세서
| 특징 | 세부 사항 |
|---|---|
| 오디오 입력 | 블루투스 5.0, USB |
| 오디오 출력 | Stereo RCA, 3.5mm AUX, 3.5mm Headphone Jack |
| 블루투스 칩 | QCC3008 (supports APT-X, APTX-LL) |
| Decode Chip | 티다1543 |
| USB 칩 | 2704 (supports up to 16bit/96kHz) |
| 헤드폰 Amp 칩 | MAX9722 |
| 신호 대 잡음비 (SNR) | > 99dB |
| 다이나믹 레인지 | > 99dB |
| 헤드폰 출력 전력 | 300mW |
| 헤드폰 임피던스 | 16-600Ω |
| 총 고조파 왜곡 + 노이즈(THD + N) | 0.004% (RL> 10kΩ) |
| 치수(길이*너비*높이) | 97 * 77 * 32mm (3.82 * 3.03 * 1.26인치) |
| 단위 무게 | 250g |
| 패키지 무게 | 470g |
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.
보증 및 지원
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.