1. Pengenalan
The LEAUDIO XDUOO MH-02 is a versatile USB Digital-to-Analog Converter (DAC) and Tube Headphone Amplifier. It combines the warmth of tube pre-amplification with the power of a Class A transistor buffer, designed to enhance your audio experience. This manual provides detailed instructions for setup, operation, and maintenance of your MH-02 unit.
2. Arahan Keselamatan
- Pastikan bekalan kuasa voltage matches the requirements specified for the device (DC 12V/2A).
- Jangan dedahkan unit kepada air, kelembapan atau suhu yang melampau.
- Elakkan meletakkan unit di bawah cahaya matahari langsung atau berhampiran sumber haba.
- Pastikan pengudaraan yang mencukupi di sekeliling unit untuk mengelakkan terlalu panas.
- Jangan cuba membuka atau membaiki unit sendiri. Rujuk semua servis kepada kakitangan yang berkelayakan.
- Jauhkan daripada kanak-kanak.
3. Kandungan Pakej
Sila semak pakej untuk item berikut:
- XDUOO MH-02 Unit
- Power Adapter (DC 12V) (Typically included, please verify packaging)
- USB Cable (Typically included, please verify packaging)
4. Produk Lebihview
4.1 Panel Depan
This image displays the front panel of the MH-02, highlighting the dual vacuum tubes, the prominent red volume control knob, the smaller red gain selection button, and the three distinct headphone output jacks.
- Output Fon Kepala 6.35mm: Bicu fon kepala standard.
- Output Fon Kepala Seimbang 4.4mm: Balanced headphone jack for compatible headphones.
- Output Fon Kepala 3.5mm: Bicu fon kepala standard.
- Tombol Kelantangan: Controls the output volume for headphones and line out.
- Gain Button: Toggles between low and high gain settings.
- Tiub Vakum: Dual 6J1 tubes for pre-amppemberitahuan.
4.2 Panel Belakang
This image illustrates the rear panel of the MH-02, featuring the RCA input and output connections, the USB-C port for digital audio, the DC 12V power input, and the main power switch.
- RCA L/R IN: Input audio analog.
- RCA L/R OUT: Analog audio line output.
- USB IN (Type-C): Digital audio input for USB DAC function.
- DC 12V: Power input jack.
- Suis kuasa: Menghidupkan atau mematikan unit.
5. Persediaan
5.1 Connecting to a USB Audio Device
This diagram illustrates two primary connection methods: USB for digital sources like laptops, and RCA for analog sources such as CD players, both leading to headphone output.
- Use a USB OTG cable (not included) to connect the MH-02's USB IN port to your computer (Windows, Linux, Mac OS X), iOS device, Android device, or HiFi player.
- Connect your headphones to one of the headphone output jacks on the front panel.
- Ensure the MH-02 is powered on.
- Select the MH-02 as the audio output device in your source device's sound settings.
5.2 Connecting to an Analog Audio Device
- Use an RCA audio cable to connect the AUX/Line output of your player (e.g., CD player) to the RCA L/R IN ports on the rear panel of the MH-02.
- Connect your headphones to one of the headphone output jacks on the front panel.
- Ensure the MH-02 is powered on.
5.3 Sambungan Kuasa
- Connect the provided DC 12V power adapter to the DC 12V input jack on the rear panel of the MH-02.
- Palamkan penyesuai kuasa ke salur keluar dinding yang sesuai.
6. Arahan Operasi
6.1 Hidupkan/Mati Kuasa
Flip the power switch on the rear panel to the 'ON' position to power on the unit. Flip it to 'OFF' to power off. A built-in relay mutes the circuit during power-on to prevent 'POP' noise and ensure optimal tube operation.
This image shows an internal relay, which is part of the built-in protection circuit designed to prevent 'POP' noise during power cycles.
6.2 Kawalan Kelantangan
Rotate the large red knob on the front panel clockwise to increase volume and counter-clockwise to decrease volume. Start with a low volume setting before playing audio to avoid sudden loud sounds.
6.3 Gain Switch Operation
This diagram explains the function of the gain switch: pressing the button activates 'LOW' gain, while leaving it unpressed selects 'HIGH' gain.
The small red button on the front panel is the gain switch. Press it gently to toggle between two gain settings: Low Gain (button pressed) and High Gain (button unpressed). Select the appropriate gain setting based on your headphones' impedance and sensitivity to achieve optimal sound and prevent over-driving or under-driving.
6.4 Using as a Pre-amplebih hidup
The MH-02 features a volume-controlled line output (RCA L/R OUT) that routes audio through its tube stage. This allows the unit to function as a pre-amplifier for other audio amplifiers or active speakers, potentially enhancing their sound quality.
7. Spesifikasi
| Parameter | Nilai |
|---|---|
| Bekalan Kuasa | DC 12V/2A |
| OS yang patuh | Windows, Linux, Mac OS X, iOS, Android |
| Sampling Rate Support (PCM) | 16-32Bit/44.1k-384kHz |
| Sampling Rate Support (DSD) | DSD64-256 |
| Kuasa Keluaran | 1300mW (32Ω beban) |
| Respons Kekerapan | 10Hz-60KHz (±0.5dB) |
| Keuntungan | +12dB / +18dB |
| THD+N | 0.8% (1KHz, 32Ω load) |
| Nisbah S/N | 113dB |
| Crosstalk | 70dB |
| Dimensi Unit (L x W x H) | 12 x 10 x 6.4 cm (lebih kurang 4.7 x 3.9 x 2.5 inci) |
| Unit Berat | 0.42 Kg (approx. 14.8 ounces) |
| Item Weight (as listed) | 14.4 auns |
| Pengeluar | LEAUDIO |
| Tarikh Mula-mula Tersedia | 20 Mei 2024 |
8. Penyelesaian masalah
- Tiada Bunyi:
- Ensure the unit is powered on and the power adapter is securely connected.
- Check all audio cables (USB, RCA, headphones) are correctly and securely connected.
- Verify the volume knob is turned up.
- If using USB, ensure the MH-02 is selected as the default audio output device on your computer or source device.
- Test with different headphones or source devices to isolate the issue.
- Bunyi Herot:
- Reduce the volume on both the MH-02 and your source device.
- Check the gain setting. If using sensitive headphones, try the 'Low Gain' setting.
- Ensure audio cables are not damaged or loose.
- Uji dengan audio yang berbeza files or sources.
- Sambungan Terputus-putus:
- Periksa semua sambungan kabel untuk kelonggaran.
- Try a different USB or RCA cable.
- Pastikan bekalan kuasa stabil.
9. Penyelenggaraan
- Pembersihan: Gunakan kain lembut dan kering untuk membersihkan bahagian luar unit. Jangan gunakan pembersih cecair atau pelarut.
- Penggantian tiub: The 6J1 vacuum tubes have a finite lifespan. If you notice a significant degradation in sound quality or tube failure, contact the manufacturer or a qualified technician for replacement instructions. Ensure the unit is powered off and unplugged before attempting any tube replacement.
- Storan: When not in use for extended periods, store the unit in a cool, dry place away from direct sunlight and dust.
10. Waranti dan Sokongan
Untuk maklumat waranti, sokongan teknikal atau pertanyaan perkhidmatan, sila rujuk dokumentasi yang diberikan bersama pembelian anda atau hubungi terus penjual/pengilang. Simpan bukti pembelian anda untuk tuntutan waranti.